Teach by Example + Increasing Vengeance

Prerequisites

You have an additional instant and/or sorcery card in hand.

Steps

1. Cast any other instant and/or sorcery spell by paying its mana cost.
2. Holding priority, cast Teach by Example by paying {U/R}{U/R}, copying the next instant or sorcery spell you cast.
3. Cast Increasing Vengeance by paying {R}{R}, targeting the instant or sorcery spell cast in step 1.
4. Teach by Example triggers, copying Increasing Vengeance, with the copy targeting the original Increasing Vengeance.
5. Resolve the copy of Increasing Vengeance, copying Increasing Vengeance, with the copy targeting the original Increasing Vengeance.
6. Repeat step 5.