Ajani, Retaliating

+1: Each opponent may deal up to 2 damage to you. Then put X loyalty counters on Ajani, where X is the amount of damage dealt to you this way.
-X: Until end of turn, players can't gain life and damage can't be prevented. Then Ajani deals X damage to target opponent.
-12: Destroy all non-land permanents target opponent controls. If that player has dealt you damage, Ajani deals 5 damage to him/her.