Herald of Eternal Dawn | Creature | Angel | Flash (You may cast this spell any time you could cast an instant.)
Flying
You can't lose the game and your opponents can't win the game. | Martina Fačková
Valkyrie's Call | Enchantment | | Whenever a nontoken, non-Angel creature you control dies, return that card to the battlefield under its owner's control with a +1/+1 counter on it. It has flying and is an Angel in addition to its other types. | Scott Murphy
Ajani, Caller of the Pride | Legendary Planeswalker | Ajani | +1: Put a +1/+1 counter on up to one target creature.
−3: Target creature gains flying and double strike until end of turn.
−8: Create X 2/2 white Cat creature tokens, where X is your life total. | D. Alexander Gregory
Progenitus | Legendary Creature | Hydra Avatar | Protection from everything
If Progenitus would be put into a graveyard from anywhere, reveal Progenitus and shuffle it into its owner's library instead. | Jaime Jones