Anthropede
{3}{G}
Creature — Insect
Oracle Text
Reach
When this creature enters, you may discard a card or pay {2}. When you do, destroy target Room.
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.