Pyromancer's Goggles, and Fork

Prerequisites

• Pyromancer's Goggles on the battlefield
• Fork in hand
• plus enough mana to cast the additional instant or sorcery available

Steps

1. Cast any instant or sorcery by paying its mana cost
2. Holding priority, activate Pyromancer's Goggles by tapping it, adding
3. Cast Fork by paying its mana cost, targeting the instant or sorcery cast in step 1
4. Pyromancer's Goggles triggers, copying Fork, with the copy targeting the original Fork
5. Resolve the copy of Fork, creating a copy of Fork targeting the original Fork
6. Repeat step 5

Results

• Infinite magecraft triggers