Cast Eternity Vessel.
Cast Dismantle targeting Eternity Vessel, destroying it and placing an amount of counters on Darksteel Reactor equal to the number of charge counters that were on Eternity Vessel.
Darksteel Reactor triggers, winning you the game.

Win the game

Darksteel Reactor

Dismantle

Eternity Vessel

Cast Dismantle by paying {2}{R}, destroying Eternity Vessel, and putting a number of charge counters on Dragonspark Reactor equal to the number Eternity Vessel had.
Activate Dragonspark Reactor by paying {4} and sacrificing it, dealing damage equal to the number of charge counters on it to an opponent and up to one target creature.
The opponent loses the game due to having 0 or less life.

Near-infinite damage to one opponent

Target opponent loses the game

Dragonspark Reactor

Activate Cascading Cataracts's second ability by paying {5} and tapping it, adding {W}{U}{B}{R}{G}.
Cast Clearwater Goblet by paying {W}{U}{B}{R}{G}.
Cast Dismantle by paying {2}{R}, targeting Clearwater Goblin and placing 20 charge counters on Darksteel Reactor.
Darksteel Reactor triggers, winning you the game.

Combos with "Dismantle"