Mimic Vat is a rare Artifact card from The Lost Caverns of Ixalan Commander (LCC), collector number 115. Current market price: $4.90 (foil $10.57), TCGplayer market prices via Scryfall.
Imprint — Whenever a nontoken creature dies, you may exile that card. If you do, return each other card exiled with this artifact to its owner's graveyard. {3}, {T}: Create a token that's a copy of a card exiled with this artifact. It gains haste. Exile it at the beginning of the next end step.