The Seventh Archetype

[Dementuo]

Because why not, let's turn our favorite Rank-Up-Magic into an entire archetype.

Undertake Seventh
Level 4/LIGHT/1700 ATK/400 DEF
Warrior-Type/Effect
When this card is Summoned: You can take one monster with “Seventh” in its name and place it on top of your deck. If you activate this effect, you cannot Special Summon any more monsters until the start of your next turn’s Battle Phase, except from the Extra Deck.

Wrath Seventh
Level 4/LIGHT/1900 ATK/1000 DEF
Warrior-Type/Effect
When this card battles an opponent’s monster: You can reveal the top card of your deck, and if it is a “Seventh” card, this card gains 600 ATK during that battle only. When this card destroys an opponent’s monster by battle: You can add 1 “Seventh” card from your deck to your hand.

Creator Seventh
Level 4/LIGHT/1000 ATK/1000 DEF
Warrior-Type/Effect
This card cannot be destroyed by battle. Once per turn: You can reveal 1 “Seventh” card in your hand; Special Summon 1 “Seventh” monster from your Graveyard, and if you do, place the revealed card on top of your deck.

Infinite Seventh
Level 4/LIGHT/0 ATK/0 DEF
Warrior-Type/Effect
You take no battle damage from battles involving this card. During your Draw Phase, instead of conducting your normal draw: You can Special Summon this card from your Graveyard, and if you do, you can place 1 “Seventh” card from your Graveyard on top of your deck.

Nightmare Seventh
Level 4/LIGHT/1800 ATK/0 DEF
Warrior-Type/Effect
While you control a “Seventh” monster, you can Special Summon this card (from your hand). When you do: You can reveal the top card of your deck, and if it is a “Seventh” Normal Spell card, you may send it to the Graveyard and activate its effect. While this card is attached to a “Number” monster with a Number between 101 and 107 as Xyz Material: You can detach this card from that monster; Special Summon one “Number C” monster from your Extra Deck with the same Number as the monster this card was attached to, using that monster as Xyz Material. (This Special Summon is treated as an Xyz Summon. Xyz Materials attached to that target also become Xyz Materials on the Summoned monster.)

The Glorious Seventh
Normal Spell
If you draw this card with your normal draw during your Draw Phase, you can keep it revealed in your hand. At the start of your Main Phase 1, if you drew this card with your normal draw during the Draw Phase of this turn and it has been revealed in your hand since then: You can activate this card, then target one “Number” monster in your Graveyard with a Number between 101 and 107, except a "Number C" monster; Special Summon that monster, then you can attach this card and up to two other cards in your Graveyard to it as Xyz Material.

The Seventh Star
Normal Spell
Reveal a “Seventh” card in your hand: Draw two cards, then shuffle the revealed card from your hand into your deck. During your Standby Phase, if you control an Xyz monster: You can banish this card from your Graveyard and place one card from your hand on top of your deck; add 1 “Rank-Up-Magic” Spell card from your deck to your hand. You can only activate one effect of “The Seventh Star” per turn, and only once that turn.

[Dementuo]

Thinking about it now, I'll probably split Nightmare into two separate monsters. It does too much.

[-Noel-]

seems fine, except for dat obviously broken card, The Glorious Seventh. No OPD clause, and if you use this after you used 71 and target something like... c104. You then have c104 on board with 3 Materials, having 104 as 1 of them... take that attach other 2 out. maybe you can have it target only 1 monster to attach (not attach that Spell).

[Dementuo]

I'll just make it not target Number C's.