Myr Incubator is a rare Artifact card from World Championship Decks 2004 (WC04), collector number mb212. Current market price: $0.40, 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.