Adaptive Training Post + Increasing Vengeance

Prerequisites

You have an instant or sorcery card in hand with enough mana to cast it. You have enough mana to cast Increasing Vengeance

Steps

1. Cast the additional instant or sorcery by paying its mana cost.
2. If Adaptive Training Post had two charge counters on it, it triggers, putting a charge counter on it.
3. Holding priority, activate Adaptive Training Post by removing three charge counters from it, copying the next instant or sorcery spell you cast this turn.
4. Cast Increasing Vengeance by paying its mana cost, targeting the spell cast in step 1.
5. Adaptive Training Post triggers, copying Increasing Vengeance, with the copy targeting the original Increasing Vengeance.
6. Resolve the copy of Increasing Vengeance, copying the original Increasing Vengeance, with the copy targeting the original Increasing Vengeance.
7. Repeat step 5.