Mordenkainen's Polymorph

Equipped creature gets +2/+2. Equip 3 (3: Attach to target creature you control. Equip only as a sorcery.)

Flying When this creature enters, target creature gets +1/+1 and gains flying until end of turn.

Double strike Teleport — 3W: This creature phases out. (Treat it and anything attached to it as though they don't exist until your next turn.)

At the beginning of your end step, if you gained 3 or more life this turn, create a 3/3 white Angel creature token with flying. WWW, T, Exile The Book of Exalted Deeds: Put an enlightened counter on target Angel. It gains "You can't lose the game and your opponents can't win the game." Activate only as a sorcery.

Whenever you gain life, put a +1/+1 counter on this creature.

(Gain the next level as a sorcery to add its ability.) If you would gain life, you gain that much life plus 1 instead. 3W: Level 2 Whenever you gain life, put a +1/+1 counter on target creature you control. 4W: Level 3 When this Class becomes level 3, return target creature card from your graveyard to the battlefield. You gain life equal to that creature's toughness.

When this creature enters, venture into the dungeon. (Enter the first room or advance to the next room.) As long as you've completed a dungeon, this creature gets +3/+0 and has flying.

When Cloister Gargoyle enters, venture into the dungeon. (Enter the first room or advance to the next room.) As long as you've completed a dungeon, Cloister Gargoyle gets +3/+0 and has flying.