Ouroboroid 
Creature — Plant Wurm
At the beginning of combat on your turn, put X +1/+1 counters on each creature you control, where X is this creature's power.
Legality
standardLEGALpioneerLEGALmodernLEGALlegacyLEGALvintageLEGALcommanderLEGAL
Creature — Plant Wurm
At the beginning of combat on your turn, put X +1/+1 counters on each creature you control, where X is this creature's power.