Gyruda, Doom of Depths is a rare Legendary Creature — Demon Kraken card from Ikoria: Lair of Behemoths (IKO), collector number 221. Current market price: $0.69 (foil $0.48), TCGplayer market prices via Scryfall.
Companion — Your starting deck contains only cards with even mana values. (If this card is your chosen companion, you may put it into your hand from outside the game for {3} as a sorcery.) When Gyruda enters, each player mills four cards. Put a creature card with an even mana value from among the milled cards onto the battlefield under your control.