Metallic Mimic is a rare Artifact Creature — Shapeshifter card from Secret Lair Drop (SLD), collector number 194. Current market price: $16.23 (foil $17.33), TCGplayer market prices via Scryfall.
As this creature enters, choose a creature type. This creature is the chosen type in addition to its other types. Each other creature you control of the chosen type enters with an additional +1/+1 counter on it.