Morgald, Harvester's Zealot

When Morgald, Harvester's Zealot enters the
battlefield, destroy target nonland permanent
with mana value X or less, where X is the
highest mana value among creatures you control.
You lose life equal to that permanent's mana
value.
If any cost or effect causes you to sacrifice
Morgald, exile it and return it to your hand at
the beginning of your next upkeep.