Tar Fiend is a rare Creature — Elemental card from Shards of Alara (ALA), collector number 89. Current market price: $0.34 (foil $0.37), TCGplayer market prices via Scryfall.
Devour 2 (As this creature enters, you may sacrifice any number of creatures. It enters with twice that many +1/+1 counters on it.) When this creature enters, target player discards a card for each creature it devoured.