Sleeper Agent
{B}
Creature — Phyrexian Minion
Oracle Text
When this creature enters, target opponent gains control of it.
At the beginning of your upkeep, this creature deals 2 damage to you.
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.