Requires

Twincast must be in hand. Increasing Vengeance must be in hand. You have an additional instant and/or sorcery card in hand. Mana needed: , plus enough mana to cast the additional instant or sorcery

Steps

1. Cast any instant or sorcery spell by paying its mana cost.
2. Holding priority, cast Increasing Vengeance by paying , targeting that spell.
3. Cast Twincast by paying , copying Increasing Vengeance, with the copy targeting Increasing Vengeance.
4. Resolve the copy of Increasing Vengeance, copying the original Increasing Vengeance, with the copy targeting the original Increasing Vengeance.
5. Repeat step 4.

Results