Activate Karn twice by paying {2}, causing Eternity Vessel and Darksteel Reactor to become artifact creatures until end of turn.
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.

Win the game

Karn, Silver Golem

Darksteel Reactor

Eternity Vessel

The Ozolith

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.

March of the Machines

Activate Phyrexian Devourer by paying {0}, exling the top card of your library and putting a number of +1/+1 counters on Phyrexian Devourer equal to that card's mana value.
If Phyrexian Devourer's power becomes seven or greater this way, it triggers.
Holding priority, repeat from step 1 until you have an empty library.
Resolve the first Phyrexian Devourer trigger, causing you to sacrifice it.
When Phyrexian Devourer leaves the battlefield, The Ozolith's first ability triggers, putting a number of +1/+1 counters on The Ozolith equal to the number Phyrexian Devourer had.
At the beginning of your combat phase, The Ozolith's second ability triggers, moving all counters from it onto Hallar.
Cast any kicker or multikicker spell with kicker by paying its mana cost plus its kicker cost.
Hallar triggers, putting a +1/+1 counter on itself, then dealing damage equal to the number of +1/+1 counters on it to each opponent.

Exile your library

Near-infinite +1/+1 counters on Hallar

Near-infinite damage

Hallar, the Firefletcher

Phyrexian Devourer

Activate Krark-Clan Ironworks by sacrificing The Ozolith, adding {C}{C}.
Yomiji triggers, returning The Ozolith from your graveyard to your hand.
Cast The Ozolith for {1}.
Repeat.

Infinite colorless mana

Infinite storm count

Yomiji, Who Bars the Way

Krark-Clan Ironworks

Activate Mimic Vat, making a token copy of Floodchaser which enters as a 0/0 with six +1/+1 counters.
Go to combat, moving all counters from Ozolith onto Sage of Hours.
Activate Sage of Hours, removing all +1/+1 counters on it, gaining an extra turn.
Pass the turn.
At the beginning of your end step, the Floodchaser token triggers, exiling itself.
The Ozolith triggers, putting six +1/+1 counters on itself.
Repeat.

Infinite turns

Sage of Hours

Mimic Vat

Floodchaser

During your precombat main phase, activate Contagion Engine by paying {6} and tapping it, putting two eon counters on Magosi.
Activate Magosi's third ability by tapping it, removing an eon counter from it and returning it from the battlefield to your hand.
When Magosi leaves the battlefield, The Ozolith's first ability triggers, putting an eon counter on The Ozolith.
Resolve the Magosi ability, causing you to take an extra turn after this one.
Play Magosi.
At the beginning of your combat phase, The Ozolith triggers, putting two eon counters on Magosi.
Repeat each turn.

Magosi, the Waterveil

Nature's Revolt

Contagion Engine

During your precombat main phase, activate Contagion Clasp by paying {4} and tapping it, putting an eon counter on Magosi.
Activate Magosi's third ability by tapping it, removing an eon counter from it and returning it from the battlefield to your hand.
When Magosi leaves the battlefield, The Ozolith's first ability triggers, putting an eon counter on The Ozolith.
Resolve the Magosi ability, causing you to take an extra turn after this one.
Play Magosi.
At the beginning of your combat phase, The Ozolith triggers, putting an eon counter on Magosi.
Repeat each turn.

Contagion Clasp

Living Plane

Cast Body of Research by paying {G}{G}{G}{U}{U}{U}, creating a 0/0 Fractal creature token, then putting a number of +1/+1 counters on it equal to your deck size.
Cause the Fractal to leave the battlefield.
The Ozolith's first ability triggers, putting a number of +1/+1 counters on The Ozolith equal to the number the Fractal had.
At the beginning of your combat phase, The Ozolith's second ability triggers, moving all counters from it onto Hallar.
Cast any kicker or multikicker spell with kicker by paying its mana cost plus its kicker cost.
Hallar triggers, putting a +1/+1 counter on itself, then dealing damage equal to the number of +1/+1 counters on it to each opponent.

Body of Research

Kill Polukranos, triggering Mimic Vat's imprint ability and The Ozolith's first ability.
Resolve the Mimic Vat trigger, exiling Polukranos.
Resolve the The Ozolith trigger, putting six +1/+1 counters on it.
Activate Mimic Vat by paying {3} and tapping it, creating a token copy of Polukranos with haste that enters with six +1/+1 counters on it.
At the beginning of combat on your turn, The Ozolith's second ability triggers, putting all counters on The Ozolith onto Sage of Hours.
Activate Sage of Hours by removing all +1/+1 counters from it, causing you to take at least one extra turn after this one.
At the beginning of your end step, Mimic Vat triggers, exiling the Polukranos token.
The Polukranos token leaves the battlefield, triggering The Ozolith, putting six +1/+1 counters on The Ozolith.
Repeat from step 4 each turn.

Polukranos, Unchained

Activate Mimic Vat, making a token copy of Custodi Soulbinders which enters as a 0/0 with five +1/+1 counters.
Go to combat, moving all counters from Ozolith onto Sage of Hours.
Activate Sage of Hours, removing all +1/+1 counters on it, gaining an extra turn.
Pass the turn.
At the beginning of your end step, the Custodi Soulbinders token triggers, exiling itself.
The Ozolith triggers, putting five +1/+1 counters on itself.
Repeat.

Custodi Soulbinders

Cast Polukranos Unchained from your graveyard for its escape cost by paying {4}{B}{G} and exiling six other cards from your graveyard, causing it to enter the battlefield with twelve +1/+1 counters on it.
Activate Altar of Dementia by sacrificing Polukranos Unchained.
When Polukranos Unchained dies, The Ozolith's first ability triggers, putting twelve +1/+1 counters on it.
Resolve the Altar of Dementia ability, causing you to mill cards equal to Polukranos Unchained's power.
At the beginning of your combat phase, The Ozolith's second ability triggers, moving the +1/+1 counters from it onto Sage of Hours.
Activate Sage of Hours by removing all +1/+1 counters from it, causing you to take at least two extra turns after this one.
Repeat during your second extra turn.

Combos with "The Ozolith"