Ember Swallower is a rare Creature — Elemental card from Theros (THS), collector number 120. Current market price: $0.17 (foil $0.14), TCGplayer market prices via Scryfall.
{5}{R}{R}: Monstrosity 3. (If this creature isn't monstrous, put three +1/+1 counters on it and it becomes monstrous.) When this creature becomes monstrous, each player sacrifices three lands of their choice.