Geonosis Droid Factory

Whenever Geonosis Droid Factory enters the battlefield, sacrifice an artifact
If an artifact you control is put into a graveyard, put X 2/2 colorless BattleDroid creature tokens onto the battlefield, where X is equal to that card's converted mana cost.
"This investment by the Banking Clan will create unimaginable new war profits. The largest droid factory ever built."