Houdis, Thief Savant

Houdis, Thief Savant can't be blocked.
Whenever Houdis, Thief Savant deals combat
damage to a player, exile target card from a
graveyard. You may cast that card this turn, and
you may spend mana as though it were mana of
any type to cast that spell. If that card would be
put into a graveyard this turn, exile it instead.
Ravnica maintains a yearly tradition of misplacing a
prized city relic.