Peregrine Drake and Timeless Witness on the battlefield.
You control up to five lands that can tap to produce at least ({2} magic symbol) ({U} magic symbol) .
Steps
Activate up to five lands by tapping them, adding at least ({2} magic symbol) ({U} magic symbol) .
Cast Ghostly Flicker by paying ({2} magic symbol) ({U} magic symbol) , blinking Timeless Witness and Peregrine Drake.
When Timeless Witness and Peregrine Drake enter the battlefield, their abilities trigger.
Resolve the Timeless Witness trigger, returning Ghostly Flicker to your hand from your graveyard.
Resolve the Peregrine Drake trigger, untapping up to five lands.
Repeat.
Notes
If you control five lands that can tap to produce at least ({3} magic symbol) ({U} magic symbol) , this combo nets infinite mana, and you may blink any other permanent besides Peregrine Drake.