Wrexial, the Risen Deep

Islandwalk, swampwalk (This creature can't be
blocked as long as defending player controls an
Island or a Swamp.)

Whenever Wrexial, the Risen Deep deals combat
damage to a player, you may cast target instant or
sorcery card from that
player's graveyard without paying its mana cost.
If that spell would be put into a graveyard, exile it instead.