Sarkhan, From the Past

+2: Dragons you control get +1/+1 and gain trample, haste, and indestructible until end of turn. Untap them.
-X: Sarkhan, From the Past deals X damage to any target. If that target is a dragon, return it to the battlefield under your control.
-10: Return all dragons from your graveyard to the battlefield under their owner's control. They gain haste and trample until end of turn.