Wrexial, the Risen Deep [Worldwake]

Description

Set:	Worldwake
Type:	Legendary Creature — Kraken
Rarity:	Mythic
Cost:	{3}{U}{U}{B}

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 this turn, exile it instead.