Prismari, the Inspiration + Insidious Will

Prismari, the Inspiration

Insidious Will

How it works

1. Cast any other instant or sorcery by paying its mana cost.
2. Holding priority, cast Insidious Will by paying its mana cost, targeting the instant or sorcery cast in step 1.
3. Insidious Will's storm ability triggers, creating at least one copy of Insidious Will targeting the original Insidious Will.
4. Resolve a copy of Insidious Will, copying Insidious Will targeting the original Insidious Will.
5. Repeat step 4.