Rootha, Mercurial Artist | Increasing Vengeance

Cards

({2} magic symbol) ({R} magic symbol) ({R} magic symbol) , plus enough mana to cast the additional instant or sorcery available.

Cast an instant or sorcery spell, or wait for an opponent to cast one.
Holding priority, cast
Increasing Vengeance by paying ({R} magic symbol) ({R} magic symbol) , targeting the spell.
Activate
Rootha by paying ({2} magic symbol) and returning it to your hand, copying
Increasing Vengeance, with the copy targeting the original
Increasing Vengeance.
Resolve the copy of
Increasing Vengeance, copying
Increasing Vengeance, targeting the original
Increasing Vengeance.
Repeat step 4.