Grozoth is a rare Creature — Leviathan card from Ravnica: City of Guilds (RAV), collector number 53. Current market price: $4.29 (foil $8.25), TCGplayer market prices via Scryfall.
Defender (This creature can't attack.) When this creature enters, you may search your library for any number of cards that have mana value 9, reveal them, put them into your hand, then shuffle. {4}: This creature loses defender until end of turn. Transmute {1}{U}{U} ({1}{U}{U}, Discard this card: Search your library for a card with the same mana value as this card, reveal it, put it into your hand, then shuffle. Transmute only as a sorcery.)