Celestial Convergence + Hex Parasite

At the beginning of your upkeep, Celestial Convergence triggers.

Holding priority, activate Hex Parasite by paying plus for each omen counter on Celestial Convergence beyond the first, removing all but one omen counter from Celestial Convergence.

Resolve the Celestial Convergence trigger, removing an omen counter from it and causing you to win the game.