Aidan, Darkened Guardian

0: When this enters the battlefield choose any creature, Player, or other Planeswalker. This takes any damage instead of the one chosen.
+3: Turn into a creature with Power and Toughness equal to current Loyalty until start of next turn. The first ability still takes effect.
-10: PASSIVE: Place a Revenge counter on anything that deals damage to this. -10: Destroy all items with Revenge counters. If Indestrucible, Exile it.