Myr Incubator is a rare Artifact card from Mirrodin (MRD), collector number 212. Current market price: $2.68 (foil $9.92), TCGplayer market prices via Scryfall.
{6}, {T}, Sacrifice this artifact: Search your library for any number of artifact cards, exile them, then create that many 1/1 colorless Myr artifact creature tokens. Then shuffle.