Pyromancer's Goggles, and Increasing Vengeance

Prerequisites

• Pyromancer's Goggles on the battlefield
• Increasing Vengeance 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 Increasing Vengeance by paying its mana cost, targeting the instant or sorcery cast in step 1
4. Pyromancer's Goggles triggers, copying Increasing Vengeance, with the copy targeting the original Increasing Vengeance
5. Resolve the copy of Increasing Vengeance, creating a copy of Increasing Vengeance targeting the original Increasing Vengeance
6. Repeat step 5

Results

• Infinite magecraft triggers