Galvanoth is a rare Creature — Beast card from Duel Decks: Izzet vs. Golgari (DDJ), collector number 10. Current market price: $0.31, TCGplayer market prices via Scryfall.
At the beginning of your upkeep, you may look at the top card of your library. You may cast it without paying its mana cost if it's an instant or sorcery spell.