Yeror, Enigma of the Seas

Hexproof, Islandwalk
When Yeror, Enigma of the Seas enters the battlefield, attacks, or defends, you may cast target instant or sorcery without paying its mana cost. If they would go into your graveyard, shuffle them into your library instead.When Yeror, Enigma of the Seas leaves the battlefield, all creatures you control can be shuffled into your library if they leave the battlefield.