Ajani, Thunderous Roar

+2: You may play one green or white creature card from your hand without paying its mana cost.
-3: Sacrifice a creature or Discard a card, if it is either a green or white card, Ajani, Thunderous Roar deals 8 damage to Target player.
-12: You get an emblem with "At the beginning of your upkeep all creatures you control get a +1/+1 counter. You gain X life equal to the counters."