Calothiel, Forest Keeper

+1: Put a +1/+1 counter on target creature. It gains vigilance and reach until the beginning of your next upkeep.
-3: Destroy target blue, black, or red creature. Then, create a 1/1 green Dryad creature token that is also a Forest land.
-7: Create a X/X green and white Elemental creature token with indestructible and trample. X is the number of lands you control.