Artifacts you control can tap to produce at least ({4} magic symbol) .
({U} magic symbol) ({R} magic symbol) plus enough mana to cast Blinkmoth Infusion and pay for commander tax, if applicable available.
Steps
Activate all mana-producing artifacts you control by tapping them, adding at least ({4} magic symbol) .
Cast Rootha either from your hand or from the command zone by paying ({1} magic symbol) ({U} magic symbol) ({R} magic symbol) plus commander tax, if applicable.
Cast Blinkmoth Infusion.
Holding priority, activate Rootha by paying ({2} magic symbol) and returning it from the battlefield to your hand, copying Blinkmoth Infusion.
Activate Twinning Glass by paying ({1} magic symbol) and tapping it, casting Rootha without paying its mana cost.
Resolve the copy of Blinkmoth Infusion, untapping all artifacts you control.
Activate all mana-producing artifacts you control by tapping them, adding at least ({4} magic symbol) .