Sigil Tracer by paying ({1} magic symbol) ({U} magic symbol) and tapping two Wizards you control, copying
Turnabout.
Resolve the
Turnabout copy, untapping all lands you control.
Holding priority, activate number of lands by tapping them, adding at least ({2} magic symbol) ({U} magic symbol) ({U} magic symbol) .
Activate
Sigil Tracer by paying ({1} magic symbol) ({U} magic symbol) and tapping two Wizards you control, copying
Turnabout.
Resolve the
Turnabout copy, untapping all creatures you control.
Notes
The combo can perform if your lands and creatures not used to copy
Turnabout can produce ({2} magic symbol) ({U} magic symbol) ({U} magic symbol) . This can reduce the amount of mana needed from lands, or provide additional infinite mana. If you have infinite ({U} magic symbol) , you can choose not to untap lands and choose to untap artifacts instead.