Lab Rats 
Sorcery
Buyback 
(You may pay an additional as you cast this spell. If you do, put this card into your hand as it resolves.)
Create a 1/1 black Rat creature token.
Legality
standardNOT LEGALpioneerNOT LEGALmodernNOT LEGALlegacyLEGALvintageLEGALcommanderLEGAL