Prismari, the Inspiration + Expansion // Explosion Combo

Prismari on the battlefield.

Expansion // Explosion in hand.

You have another instant or sorcery card in hand with the mana to cast it and applicable target(s) if needed.

available

Cast any other instant or sorcery by paying its mana cost.

Holding priority, cast Expansion by paying its mana cost, targeting the instant or sorcery cast in step 1.

Expansion's storm ability triggers, creating at least one copy of Expansion targeting the original Expansion

Resolve a copy of Expansion, copying Expansion targeting the original Expansion

Repeat step 4.

Infinite magecraft triggers