永生霊 ゼルネアス (Eiseirei Zeruneasu)
1 Tuner + 2 or more non-Tuner Fairy-Type monsters
This card cannot be destroyed by battle with Dragon-Type monsters. When a Fairy-Type monster attacks: It gains 600 ATK during the Damage Step only. Once per turn, you can target 1 monster you control, except this card: It cannot be destroyed by battle. When this card is destroyed (either by battle or a card effect): Return it to the Extra Deck, then target 1 of this card's Synchro Material monsters in your Graveyard; Special Summon that target.
So, a little explanation on its effects in the event you're wondering why it has them.
- First effect is an obvious note to Fairy having immunity to Dragons
- ATK gain effect for Fairies is a reference to Xerneas' ability that powers up Fairy moves.
- Giving monsters immunity to battle destruction comes from the Pokedex entries and biology. Also, when it gets killed in battle/by effect (its life ends), it "gives" life again to 1 of the monsters used to summon it.
(If I have time to make them, then Yveltal and Zygarde will also be done.)
Pic is the concept art that was posted prior to XY's release; you should be able to find it on Google Images or something.
Anyway, you know what to do at this point: CnC, rate, etc.