Valda, Conquering Dragon

+1: Create a 1/1 black and red Dragon creature token with flying and haste. Put a +1/+1 counter on it at the beginning of the next end step.
-3: Gain control of target land. Valda, Conquering Dragon deals 3 damage to target creature that land's owner controls.
-7: Gain control of up to four target creatures. Untap them. They gain haste. Sacrifice them at the beginning of the next end step.