Barrier of Bones
{B}
Creature — Skeleton Wall
Oracle Text
Defender
When this creature enters, surveil 1. (Look at the top card of your library. You may put that card into your graveyard.)
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.