Umaril, the Unfeathered

Whenever Umaril deals combat damage to a
player, you may attach a non-aura enchantment
to him.
Effects of enchantments attached to Umaril are doubled.
When Umaril dies, sacrifice all non-aura enchantments attached to Umaril.
Non-aura enchantments attached to Umaril
have "{5}: Return this card to your hand."
Sacrifice an enchantment: Regenerate Umaril.