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This thing converts your dead mechs into even more Powerstones to play more mechs with. Nifty (if a bit expensive), and probably contributes to an infinite combo somewhere.
Source: Commander RC
Pyxis of Pandemonium
Conjurer's Bauble
Can't think of anything better right now.
*EDIT*
- forgot that the 1mv artifact would have summoning sickness. Oh well.