Some cards I made. (Hope this is meant to be in this category)

[CielSenpai]

Just so you know "ProtectedGaming" is my other account, I just decided to make another account with a different email.
 [spoiler=First Set Of Cards]

Red-Eyes Blue Dragon
LV10 | Wind | Dragon | Fusion/Gemini 
"Blue-Eyes White Dragon + Red-Eyes B. Dragon". Must be Fusion Summoned with Fusion Gate and cannot be summoned any other ways. You can Normal Summon this card to gain this effect; Once per turn target 1 monster that isn't a Dragon monster, you can choose to shuffle it into the deck or return it to the hand."

3400 ATK/3000 DEF.

Updated:

"Blue-Eyes White Dragon + Red-Eyes B. Dragon". Must be first be Fusion Summoned with Fusion Gate and cannot be summoned any other ways. You can Normal Summon this card to gain this effect; Once per turn target 1 monster that isn't a Dragon monster, you can choose to shuffle it into the deck or return it to the hand."

 

Dark Mirror Force Dragon
LV8 | Dark | Dragon | Fusion / Effect
"Must be Special Summoned with "The Fang of Critias", using "Dark Mirror Force" and cannot be Special Summoned by other ways except by "Re-Fusion". When an effect that doesn't target removes your card(s) from the field you can negate that effect, then banish your opponent's monster(s) and you can banish up-to 2 cards from your opponent's field or banish 3 cards from your opponent's deck face-down, then they draw 1 card. If this card is summoned by the effect of "Re-Fusion" then you can activate this effect: Draw 1 card"
1000 ATK/3000 DEF
 

Both Sides of a Blade
Trap
"When a Monster battles another Monster choose 1 battling Monster they gain double ATK for that battle but then after, half their ATK and DEF."
 

Dual Fated
6 | Light | Warrior | Effect
"This Monster can be used as 2 XYZ Materials for a Rank 4 Monster. A Rank 4 Monster which requires 3 or more XYZ Materials with this as a XYZ Material gains this effect: When this Monster is destroyed you can Special Summon all XYZ Materials attached to it. Also this counts as your Pendulum Summon for the turn."
1900 ATK/1000 DEF

 

Updated:

"This Monster can be used as 2 XYZ Materials for a Rank 4 Monster. A Rank 4 Monster which requires 3 or more XYZ Materials with this as a XYZ Material gains this effect: Once per 2 turns you can attach 1 card from your hand to this card. When this Monster is destroyed you can Special Summon all XYZ Materials attached to it. Also this counts as your Pendulum Summon for the turn."

 

Caddica Assassin
LV8 | Light | Warrior | Effect 
"Once per duel, target 1 face-down Monster, remove it from play."
2300 ATK/1000 DEF.

 

Updated:

"When this card is Summoned target 1 face-down Monster, remove it from play. When this card is destroyed you can banish 1 face-up Spell/Trap card."
 
Number 201: Zerohero
R4 | Light | Spellcaster | XYZ
"Needed to put Requires 5 Rank 4 Monsters. Once per turn you can pay detach 1 XYZ Material, this card gains 2000 ATK and 2000 DEF until your opponent activates a Field Spell or Counter Trap. If you control 1 other monster you can banish this card, return it the next turn with every card in the Graveyard  This card was deemed unfit for Casual Cards, removed just in case I get into trouble.
 

Shackle Mind
Spell | Equip
"This card can only stay on the field if you have 1 Monster on the field. The monster equipped with this card cannot be destroyed by battle, after 3 turns all damage you took with battles involving this card is inflicted to your opponent."

 

Updated:

"This card can only stay on the field if only you have Fusion or Synchro 1 Monster on the field. The monster equipped with this card cannot be destroyed by battle, after 3 turns all damage you took with battles involving this card is inflicted to your opponent."
 

BACKSLASH!!! (More Support in Second Set)
Spell | Equip
"Equip only to a Level 6 or higher Warrior with an effect. Negate the effect, also this card gains 500 ATK and DEF for each face-down monster or face-down banished cards."

 

Updated:

"Equip only to a Level 6 or higher Warrior with an effect. Negate the effect, also this card gains 100 ATK and DEF for each face-down monster or face-down banished cards."
 

Give or Take
Trap | Continuous
"During your opponent's Draw Phase they either give you the card they drawed and then they can draw another or take 1 card from your hand then you draw 2 cards and gain 1000 Life Points. During your Standby Phase your opponent draws 1 card."

 

Updated:

"During your opponent's Draw Phase they either give you the card they drawed and then they can draw another or take 1 card from your hand then you draw 2 cards and gain 1000 Life Points. During your Standby Phase your opponent can draw 1 card but they discard 2 cards from their hand if they did."

 

 

 

[spoiler=Second Set Of Cards]

XYZ Spinner

LV9 | Fire | Pyro | Synchro (First Synchro! And the last! I hate Synchros.) | Effect

"Requires 1 Tuner Monster and 1 or more non-tuner XYZ Monsters. Twice per duel, if your opponent Special Summons an Extra Deck Monster you can roll a dice, if the result equals 1 or 6 negate the summon and Special Summon 1 XYZ Monster with a Rank lower than the negated monster's Level or Rank and attach 2 tokens as XYZ Materials to it. Also take 1000 Damage."

(Start of "BACKSLASH!!!" Support)

 

Double Kill

LV8 | Light | Warrior | Effect

"FLIP: Draw 1 card and banish 1 face-up monster on the field face-down."

2400 ATK/2400 DEF

 

Warrior of the Dead

LV8 | Light | Warrior | Effect

"Once per turn target 1 card in your graveyard, banish it face-down. This card gains 100 DEF for each face-down banished card"

2700 ATK/2700 DEF

 

Sword Art - A

Spell | Equip

"Equip only to a monster that has "BACKSLASH!!!" equipped to it. Every 5 turns it can activate its effect."

 

Sword Art - B

Spell | Equip

"Equip only to a monster that has "BACKSLASH!!!" equipped to it. It gains 500 ATK and DEF."

 

Sword Art - C

Spell | Equip

"Equip only to a monster that has "BACKSLASH!!!" equipped to it. Once per turn it can increase it's ATK by 100."

 

Sword Art - Ultimate

Spell | Equip

"Equip only to a monster that has "BACKSLASH!!!", "Sword Art - A", "Sword Art - B" and "Sword Art - C" already equipped. When this effect is activated destroy the above cards (Worded poorly, basically remove the equips.). The equipped monster gains 300 ATK and DEF for every face-down card on the field or in the banished zone and gains 100 ATK and DEF for each face-up banished cards and face-up Pendulum monsters in the Extra Deck or in the Pendulum Zones. The equipped monster only can activated its effect every 2 turns."

 

 

Elemental HERO Cosmos Gate

LV1 / Light / Warrior / Effect

"Elemental HERO Avian + Elemental HERO Clayman.

Must be summoned by Fusion Gate during your Main Phase 1 or summoned by Polymerization during your Main Phase 2. When you Fusion Summon using Fusion Gate you can put 1 counter on this card (max. 3) this card gains 500 ATK and DEF for each counter on this card. You can remove 3 counters off this card, then add up-to 2 "HERO" cards from your graveyard or deck."

 

 

 
Hope you liked these card ideas! This is my first couple of cards I have made. Feedback would be appreciated.

Update 1: Added more cards (Mostly "BACKSLASH!!!" support) and buffed/debuffed some cards.

[DiplomatfromPluto]

Red Eyes Blue Dragon being restricted to a single card for summoning is a little restrictive, you could change the text to "must first be Fusion Summoned, and cannot be summoned any other ways." This requires the card to be Fusion Summoned, but it allows for more means of getting the card out. It's gemini effect (in which you can say 'non dragon-type monster' is pretty good, since it can get rid of pretty much any monster except dragons. 

 

Dark Mirror Force Dragon is interesting, a player using it would definitely want to banish cards from the field, since giving the opponent a +1 isn't usually very desirable. 

 

The level 6 monster might be difficult to use since rank 4s will usually detach 1 or all materials to get their effects since they're so powerful, but it might have some use. Caddica Assassin is a bit weak for level 8, and banishing 1 monster doesn't seem like an effect so good that it needs to be so limited. Maybe you could change it to "when this monster is Normal or Special Summoned".

 

Shackle Mind would prevent you from making Extra deck monsters unless you already have 1 out, and it would still force you to rely on one monster. The only way to use it is if the player had a lot of backrow to prevent their monster's removal from the field. 

 

Backslash has me wondering what level 6+ warriors would want to use this card, but it has a nice effect, since flipping monsters face-down is a way to get rid of them. Although, since destroying set monsters ignores damage calcs, it'd have to destroy another monster to get some use out of its ATK boosts. Counting banished cards seems a little strange to me, while it would give the monster like 5000 ATK because of people using Pot of Desires so much, the cards are banished which is supposed to mean they're no longer in the game, even though many decks rely on banishing now. 

 

The trap has very few applications. The opponent could give you a card that they couldn't use; though in a mirror match, they might be able to take a card from the opponent that they could use. But that would give their opponent (the controller of this card) 2 more cards. Either way, the person playing this card gives their opponent a free draw every turn, for no conceivable reason.

[CielSenpai]

Red Eyes Blue Dragon being restricted to a single card for summoning is a little restrictive, you could change the text to "must first be Fusion Summoned, and cannot be summoned any other ways." This requires the card to be Fusion Summoned, but it allows for more means of getting the card out. It's gemini effect (in which you can say 'non dragon-type monster' is pretty good, since it can get rid of pretty much any monster except dragons. 

 

Dark Mirror Force Dragon is interesting, a player using it would definitely want to banish cards from the field, since giving the opponent a +1 isn't usually very desirable. 

 

The level 6 monster might be difficult to use since rank 4s will usually detach 1 or all materials to get their effects since they're so powerful, but it might have some use. Caddica Assassin is a bit weak for level 8, and banishing 1 monster doesn't seem like an effect so good that it needs to be so limited. Maybe you could change it to "when this monster is Normal or Special Summoned".

 

Shackle Mind would prevent you from making Extra deck monsters unless you already have 1 out, and it would still force you to rely on one monster. The only way to use it is if the player had a lot of backrow to prevent their monster's removal from the field. 

 

Backslash has me wondering what level 6+ warriors would want to use this card, but it has a nice effect, since flipping monsters face-down is a way to get rid of them. Although, since destroying set monsters ignores damage calcs, it'd have to destroy another monster to get some use out of its ATK boosts. Counting banished cards seems a little strange to me, while it would give the monster like 5000 ATK because of people using Pot of Desires so much, the cards are banished which is supposed to mean they're no longer in the game, even though many decks rely on banishing now. 

 

The trap has very few applications. The opponent could give you a card that they couldn't use; though in a mirror match, they might be able to take a card from the opponent that they could use. But that would give their opponent (the controller of this card) 2 more cards. Either way, the person playing this card gives their opponent a free draw every turn, for no conceivable reason.

Ah, okay, thanks for the feed back! Sadly I can't change the card's text because I have to find the images again and I can't save the cards so I have to use an image hosting service but still this gives me more ideas so thank you! I am just going to put updated under the card so the original effect and the new one should be under it, doing that now!