Run Amok 

Instant
Target attacking creature gets +3/+3 and gains trample until end of turn.
Legality
standardNOT LEGALpioneerLEGALmodernLEGALlegacyLEGALvintageLEGALcommanderLEGAL
Instant
Target attacking creature gets +3/+3 and gains trample until end of turn.