Harbinger Crow

Flying
Harbinger Crow cannot be countered.
During your end step, place a doom counter on Harbinger Crow. When Harbinger Crow has 5 doom counters, Choose one-
-Exile all permanents, all cards from all graveyards and each player's hand.
-Each player's life total becomes equal to Harbinger Crow's toughness.
"Beware the crow with pure white eyes, lest evil consume you and those you meet."