Pyromancer's Goggles, and Flare of Duplication

Prerequisites

• Pyromancer's Goggles on the battlefield
• Flare of Duplication in hand

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 Flare of Duplication by paying its mana cost or by sacrificing a nontoken red creature, targeting the instant or sorcery cast in step 1
4. Pyromancer's Goggles triggers, copying Flare of Duplication, with the copy targeting the original Flare of Duplication
5. Resolve the copy of Flare of Duplication, creating a copy of Flare of Duplication targeting the original Flare of Duplication
6. Repeat step 5

Results

• Infinite magecraft triggers