Cast Approach of the Second Sun by paying {6}{W}.
Holding priority, cast Remand by paying {1}{U}, countering Approach of the Second Sun and returning it to your hand.
Cast Approach of the Second Sun by paying {6}{W}, causing you to win the game.

Win the game

Approach of the Second Sun

Remand

Cast Karn's Temporal Sundering by paying {4}{U}{U}.
The Sixth Doctor triggers, copying Karn's Temporal Sundering.
Resolve the copy of Karn's Temporal Sundering, causing you to take an extra turn after this one.
Holding priority, activate Isochron Scepter by paying {2} and tapping it, casting a copy of Remand without paying its mana cost.
Resolve Remand, returning the original Karn's Temporal Sundering to your hand and causing you to draw a card.
Repeat each turn.

Combos with "Remand"