Mishra's Foundry is a rare Land card from The Brothers' War (BRO), collector number 265. Current market price: $0.34 (foil $0.38), TCGplayer market prices via Scryfall.
{T}: Add {C}. {2}: This land becomes a 2/2 Assembly-Worker artifact creature until end of turn. It's still a land. {1}, {T}: Target attacking Assembly-Worker gets +2/+2 until end of turn.