Cid, Timeless Artificer is a legendary Artificer that uniquely allows a deck to contain any number of copies, even bypassing Commander's singleton rule. It strengthens your artifact creatures and Heroes for each Artificer you control and each Artificer card in your graveyard.
Extra copies of Cid can be cycled into the graveyard to increase that bonus while drawing new cards. Artifact creatures, Artificers, and token producers such as Sai, Master Thopterist give the resulting deck plenty of creatures to pump.
