Tibalt, Walking Inferno

0: Until your next turn, Tibalt, Walking Inferno has "Whenever this planeswalker takes damage, prevent it. He gains that many loyalty counters."
-6: Tibalt deals 6 damage to target creature and 6 damage to that creature's controller. If a creature died this way, exile it.
-20: All opponents sacrifice half their creatures, put half their deck in their graveyard, and lose half their life, rounded up.