Doppelgang | Mystic Sanctuary | Commander's Sphere

Cards

You control at least two additional Islands.
You control at least two additional permanents that enter the battlefield untapped and can collectively tap to produce at least ({2} magic symbol) if the two additional Islands enter the battlefield tapped.

Cast
Doppelgang by paying ({12} magic symbol) ({G} magic symbol) ({U} magic symbol) , creating four token copies of
Mystic Sanctuary,
Commander's Sphere, and two other permanents that enter the battlefield untapped and can collectively tap to produce at least ({2} magic symbol) .
When the
Mystic Sanctuary tokens enter the battlefield untapped, they trigger, putting
Doppelgang on top of your library from your graveyard.
Activate a
Commander's Sphere token's second ability by sacrificing it, causing you to draw
Doppelgang.
Activate the four
Mystic Sanctuary tokens by tapping them, adding ({U} magic symbol) ({U} magic symbol) ({U} magic symbol) ({U} magic symbol) .
Activate the three
Commander's Sphere tokens' first abilities by tapping them, adding ({2} magic symbol) ({G} magic symbol) .
Activate seven of the other permanent tokens created in step 1 by tapping them, adding at least ({7} magic symbol) .
Repeat.