Molten Sentry is a rare Creature — Elemental card from Ravnica: City of Guilds (RAV), collector number 136. Current market price: $0.34 (foil $0.79), TCGplayer market prices via Scryfall.
As this creature enters, flip a coin. If the coin comes up heads, this creature enters as a 5/2 creature with haste. If it comes up tails, this creature enters as a 2/5 creature with defender.