Tatyova, Benthic Druid | Doppelgang | Mystic Sanctuary

Cards

Doppelgang in hand.
Tatyova and
Mystic Sanctuary on the battlefield.
You control at least two additional Islands.
You control at least three additional permanents that enter the battlefield untapped and can collectively tap to produce at least ({2} magic symbol) ({G} magic symbol) .
({12} magic symbol) ({G} magic symbol) ({U} magic symbol) available.

Cast
Doppelgang by paying ({12} magic symbol) ({G} magic symbol) ({U} magic symbol) , creating four token copies of
Mystic Sanctuary and three other permanents that enter the battlefield untapped and can collectively tap to produce at least ({2} magic symbol) ({G} magic symbol) .
When the tokens enter the battlefield untapped, each
Mystic Sanctuary token triggers, and
Tatyova triggers for each land token that entered the battlefield.
Resolve all
Mystic Sanctuary triggers, putting
Doppelgang on top of your library from your graveyard.
Resolve all
Tatyova triggers, causing you to draw that many cards, including
Doppelgang with the first draw, and gain that much life.
Activate the four
Mystic Sanctuary tokens by tapping them, adding ({U} magic symbol) ({U} magic symbol) ({U} magic symbol) ({U} magic symbol) .
Activate ten of the other permanent tokens created in step 1 by tapping them, adding at least ({9} magic symbol) ({G} magic symbol) .
Repeat.