Wrexial, the Risen Deep is a mythic Legendary Creature — Kraken card from Commander Anthology Volume II (CM2), collector number 171. Current market price: $1.80, TCGplayer market prices via Scryfall.
Islandwalk, swampwalk (This creature can't be blocked as long as defending player controls an Island or a Swamp.) Whenever Wrexial 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.