Skullslither Worm
{3}{B}
Creature — Worm
Oracle Text
When this creature enters, each opponent discards a card. For each opponent who can't, put two +1/+1 counters on this creature.
Watch Out
ETB trigger, not a cast triggerRules Note
This card's ability triggers when it enters the battlefield, not when it's cast. Effects that double ETB triggers (like Panharmonicon) work here. Countering the spell prevents the creature from entering, so the ETB won't fire.