You control up to seven lands that can tap to produce at least ({2} magic symbol) ({U} magic symbol) .
Steps
Activate up to seven 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 Mnemonic Wall and Palinchron.
When Mnemonic Wall and Palinchron enter the battlefield, their abilities trigger.
Resolve the Mnemonic Wall trigger, returning Ghostly Flicker to your hand from your graveyard.
Resolve the Palinchron trigger, untapping up to seven lands.
Repeat.
If you control seven 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 Palinchron.