Mimic is a common Artifact — Treasure card from Adventures in the Forgotten Realms (AFR), collector number 349. Current market price: $0.21 (foil $0.31), TCGplayer market prices via Scryfall.
{T}, Sacrifice this artifact: Add one mana of any color. {2}: This artifact becomes a Shapeshifter artifact creature with base power and toughness 3/3 until end of turn.