Declare a creature as an attacker. Dawnsire triggers, dealing 100 damage to itself.
Dawnsire dies as a state-based action, triggering Resourceful Defense, putting at least twenty charge counters on Darksteel Reactor.
Darksteel Reactor triggers, causing you to win the game.

Win the game

Dawnsire, Sunstar Dreadnought

Darksteel Reactor

Resourceful Defense

Activate Resourceful Defense by paying {4}{W}, moving all charge counters from Eternity Vessel to Darksteel Reactor.
Darksteel Reactor's second ability triggers, causing you to win the game.

Eternity Vessel

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.

Dismantle

Use Cyberdrive Awakener to make Eternity Vessel a creature.
Cause Eternity Vessel to leave the battlefield.
The Ozolith triggers, putting a number of charge counters on itself equal to the charge counters that were on Eternity Vessel.
At the beginning of your combat phase, The Ozolith triggers, moving all counters from it onto Darksteel Reactor.
Darksteel Reactor triggers, causing you to win the game.

Cyberdrive Awakener

The Ozolith

Cast Masterful Replication by paying {5}{U}, causing each artifact you control to become a copy of Darksteel Reactor until end of turn.
Eternity Vessel's second ability triggers, causing you to win the game.

Masterful Replication

Cast True Polymorph causing Eternity Vessel to become a copy of Darksteel Reactor.
You win the game.

True Polymorph

Activate Saheeli by removing two loyalty counters from it, causing Eternity Vessel to become a copy of Darksteel Reactor until end of turn.
Eternity Vessel's second ability triggers, causing you to win the game.

Saheeli, Sublime Artificer

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 "Darksteel Reactor"