Trella, Mistress of Air

+1: Put a colorless Redirect artifact token into play, it has "Tap, Sacrifice this token: change the target of a spell or ability with one target".
-2: Search your library for two creature cards and exile them. Until the end of your next turn you may play these cards as if they were in your hand.
-5: Create two colorless 7/5 Air Elemental creature tokens with flying, haste and lifelink.