Attack an opponent with Ilharg, putting Medomai onto the battlefield with the trigger.
When Medomai hits, you get an extra turn.
At the end of the turn, Medomai returns to your hand.
During the next turn, attack with Ilharg again.
You may still put Medomai onto the field tapped and attacking even though it is during an extra turn because Medomai is never declared as an attacker.

Infinite turns

Lock

Ilharg, the Raze-Boar

Medomai the Ageless

Activate Altar of Dementia by sacrificing Ilharg.
When Ilharg dies, it triggers, putting itself into your library third from the top.
Resolve the Altar of Dementia ability, causing you to mill cards equal to Ilharg's power, ultimately milling Ilharg.
Colossal Grave-Reaver's second ability triggers, putting Ilharg from your graveyard onto the battlefield.
Repeat.

Infinite creature LTB

Infinite creature ETB

Infinite creature sacrifice triggers

Infinite death triggers

Infinite self-mill

Colossal Grave-Reaver

Altar of Dementia

Attack with Ilharg.
Ilharg's attack trigger triggers, putting Wormfang Manta onto the battlefield tapped and attacking.
At the beginning of your end step, Wormfang Manta is returned to your hand.
This triggers its LTB, granting you an extra turn after this one.
Repeat for infinite turns.

Wormfang Manta

Torpor Orb

Tocatli Honor Guard

Hushbringer

Hushwing Gryff

Activate Altar of Dementia by sacrificing Ilharg.
When Ilharg dies, it triggers, putting itself from your graveyard into your library.
Resolve the Altar of Dementia ability, causing you to mill cards equal to Ilharg's power, which will cause you to mill Ilharg.
As Ilharg is a Lhurgoyf due to Maskwood Nexus, Disa's first ability triggers, returning Ilharg from your graveyard to the battlefield.
Repeat.

Disa the Restless

Maskwood Nexus

Combos with "Ilharg, the Raze-Boar"