Skullslither Worm 
Creature — Worm
When this creature enters, each opponent discards a card. For each opponent who can't, put two +1/+1 counters on this creature.
Legality
standardNOT LEGALpioneerNOT LEGALmodernNOT LEGALlegacyLEGALvintageLEGALcommanderLEGAL