Tranquil Frillback is a rare Creature — Dinosaur card from March of the Machine: The Aftermath (MAT), collector number 164. Current market price: $2.96 (foil $3.17), TCGplayer market prices via Scryfall.
When this creature enters, you may pay {G} up to three times. When you pay this cost one or more times, choose up to that many — • Destroy target artifact or enchantment. • Exile target player's graveyard. • You gain 4 life.