Counter target spell. Ionize deals 2 damage to that spell's controller.
Legalities
Not Legal
Alchemy
Future
Oldschool
Pauper
Paupercommander
Predh
Premodern
Standard
Standardbrawl
Legal
Brawl
Commander
Duel
Explorer
Gladiator
Historic
Legacy
Modern
Oathbreaker
Penny
Pioneer
Timeless
Vintage
Rulings
2018-10-05
A spell that can’t be countered is a legal target for Ionize. The spell won’t be countered when Ionize resolves, but Ionize still deals 2 damage to that spell’s controller.