Reptillian + Ninja Werewolf

[Codeson]

 

This card can not be Normal Summoned or Special Summoned this card can only be Set by tributing 1 face -up Defense Position Reptile monster. When this card is flipped face up all monsters on the field are changed to to face-down Defense Position. If this card is destroyed by battle, destroy all face-up monsters on the field.

 

 

Once per turn pay 500 Life Points to add 1 "Moon Counter" to this card, if this card has 5 "Moon Counters" on it increase thisc ards ATK by 1000. If this card has 5 "Moon Counters" on it Remove it from Play and increase your Life Points by 1000.

[♥ ЅϯᵲåώӀӞ℮ᴙʀɣ−ɴɨɨ−ƈħåɴ ♥]

It's not possible to Tribute a face-down Reptile monster as that would require you to flip the selected Tribute monster face-up first (in order to check the monster's card type). That would remove its face-down status, and would thus be unable to follow this card's summoning condition. Minor issue, easy to fix.

 

As for the rest of it, it's fine. Since you're not stating the flip effect as the first written effect of the monster, you use "When this card is flipped face-up..." instead.

 

Card is good. Could be good Reptile support. I don't use them, so I can't give too much of an informed opinion on its usefulness.

[Codeson]

Updated

[Codeson]

bump

[♥ ЅϯᵲåώӀӞ℮ᴙʀɣ−ɴɨɨ−ƈħåɴ ♥]

Reptillian

 

This card cannot be Normal or Special Summoned. This card cannot be Set except by Tributing 1 face-down Defense Position Reptile-Type monster. If the target is face-down, flip it face-up. If it is not a Reptile-Type monster, flip it face-down. Flip Effects are not activated at this time. When this card is flipped face-up, change all monsters on the field to face-down Defense Position. When this card is destroyed by battle, destroy all face-up monsters on the field.

 

That... should be fine. Yeah.