Prismari, the Inspiration + Expansion // Explosion

Prerequisites

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

Steps

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

Effects

• Infinite magecraft triggers