Sarkhan, Lord of Dragons

+1: Sarkhan becomes a 5/5 red dragon creature with flying, haste, trample, hexproof, and indestructible until your next turn.
-3: Dragons you control get +3/+3 and gain trample until end of turn. Whenever a dragon you control deals damage this turn, draw a card.
-17: Create two 5/5 red dragon creature tokens with flying and trample, then destroy all non-dragon creatures.