Guile + Flusterstorm Combo

Guile on the battlefield.

Flusterstorm in hand.

You have an additional instant or sorcery card in hand.

plus enough mana to cast the instant or sorcery card available

Cast the additional instant or sorcery spell.

Holding priority, cast Flusterstorm by paying , targeting the instant or sorcery.

Flusterstorm's storm ability triggers, creating a copy of Flusterstorm for each spell you've cast before it this turn, with each copy targeting the original Flusterstorm.

Resolve a copy of Flusterstorm, exiling Flusterstorm and allowing you to cast it from exile without paying its mana cost, targeting the instant or sorcery spell.

Repeat from step 3.

Infinite magecraft triggers

Infinite storm count