Fist of Suns 
Artifact
You may pay 
rather than pay the mana cost for spells you cast.
Legality
standardNOT LEGALpioneerNOT LEGALmodernLEGALlegacyLEGALvintageLEGALcommanderLEGAL
Artifact
You may pay rather than pay the mana cost for spells you cast.