Great Whale and Salvager of Secrets on the battlefield.
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 Salvager of Secrets and Great Whale.
When Salvager of Secrets and Great Whale enter the battlefield, their abilities trigger.
Resolve the Salvager of Secrets trigger, returning Ghostly Flicker to your hand from your graveyard.
Resolve the Great Whale 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 Great Whale.