Sarkhan Unvowed

+2: Draw a card. If it's a Dragon, you may reveal it, and you may spend mana as if it were mana of any color to cast it until the end of turn.
-3: Sarkhan deals 3+X damage to target creature or Planeswalker, where X is the number of Dragons you control.
-11: Create X 5/5 Dragon creature tokens with Flying, where X is the highest power among all creatures times 2. They gain Haste until end of turn.