Pyromancer's Goggles | Reverberate

Cards

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

Cast any instant or sorcery by paying its mana cost.
Holding priority, activate
Pyromancer's Goggles by tapping it, adding ({R} magic symbol) .
Cast
Reverberate by paying its mana cost, targeting the instant or sorcery cast in step 1.
Pyromancer's Goggles triggers, copying
Reverberate, with the copy targeting the original
Reverberate.
Resolve the copy of
Reverberate, creating a copy of
Reverberate targeting the original
Reverberate.
Repeat step 5.

This combo has been estimated to be Exhibition (Bracket 1+).