Twinning Staff, and Narset's Reversal

Prerequisites

• Twinning Staff on the battlefield
• Narset's Reversal in hand
• an instant or sorcery spell in hand
• Mana available to cast the instant or sorcery spell
• available

Steps

1. Cast the instant or sorcery spell
2. Holding priority, cast Narset's Reversal by paying , targeting the instant or sorcery spell
3. Holding priority, activate twinning staff by paying targeting Narset's Reversal, copying Narset's Reversal twice
4. Resolve one copy of Narset's Reversal targeting another copy of Narset's Reversal, copying it twice and returning the targeted copy to your hand
5. Repeat step 4

Results

• Infinite magecraft triggers