Surge of Strength 
Instant
As an additional cost to cast this spell, discard a red or green card. Target creature gains trample and gets +X/+0 until end of turn, where X is that creature's mana value.
Legality
standardNOT LEGALpioneerNOT LEGALmodernNOT LEGALlegacyLEGALvintageLEGALcommanderLEGAL