This clever puzzle hinges on the flash-granting static ability of Whirlwing Stormbrood // Dynamic Soar, which lets you cast your primary sorcery at instant speed during your opponent's end step. As Approach of the Second Sun sits on the stack heading toward resolution, you immediately target it with Lapse of Certainty, turning a counterspell into a delivery mechanism that places the card on top of your library instead of the graveyard. Because you already cast a copy of Approach of the Second Sun earlier in the game, drawing it for your turn and casting it for its standard cost fulfills the card's win condition instantly.