Ashroot Animist 
Creature — Lizard Druid
Trample Whenever this creature attacks, another target creature you control gains trample and gets +X/+X until end of turn, where X is this creature's power.
Legality
standardLEGALpioneerLEGALmodernLEGALlegacyLEGALvintageLEGALcommanderLEGAL