Bellowing Tanglewurm 
Creature — Wurm
Intimidate (This creature can't be blocked except by artifact creatures and/or creatures that share a color with it.) Other green creatures you control have intimidate.
Legality
standardNOT LEGALpioneerNOT LEGALmodernLEGALlegacyLEGALvintageLEGALcommanderLEGAL