Isochron Scepter | Narset's Reversal | Hidden Strings

(and one other card)

Activate
Chromatic Orrery's first ability by tapping it, adding ({5} magic symbol) .
Cast HIdden Strings by paying ({2} magic symbol) , targeting any two applicable targets.
Activate
Isochron Scepter by paying ({2} magic symbol) and tapping it, casting a copy of
Narset's Reversal without paying its mana cost.
Resolve
Narset's Reversal, returning
Hidden Strings to your hand and creating a copy of it, targeting
Isochron Scepter and
Chromatic Orrery.
Resolve the copy of
Hidden Strings, untapping
Isochron Scepter and
Chromatic Orrery.
Repeat.
Once you have infinite mana, you may use
Chromatic Orrery's second ability if you control a colored permanent and/or untap any other permanent(s) you control.