Prismwake Merrow
{2}{U}
Creature — Merfolk Wizard
Oracle Text
Flash
When this creature enters, target permanent becomes the color or colors of your choice until end of turn.
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.