Zai

+2: If one or more creatures attack you or Zai, destroy one target attacking creature. This effect stacks until expended.
-3: Remove up to two counters each from up to three target permanents. For each target less than three, Zai gains one loyalty counter.
-12: You get an emblem with "Whenever a card is exiled, you may gain 5 life. If a card would be put into a graveyard, exile it instead."