Accelerated Mutation 
Instant
Target creature gets +X/+X until end of turn, where X is the greatest mana value among permanents you control.
Legality
standardNOT LEGALpioneerNOT LEGALmodernNOT LEGALlegacyLEGALvintageLEGALcommanderLEGAL
Instant
Target creature gets +X/+X until end of turn, where X is the greatest mana value among permanents you control.