Sacrifice Iridescent Drake to Altar of Dementia.
False Demise returns Iridescent Drake to the battlefield.
Iridescent Drake returns False Demise to the battlefield attached to itself.
Repeat.

Infinite ETB

Infinite LTB

Infinite mill

Iridescent Drake

False Demise

Altar of Dementia

Sacrifice Iridescent Drake to Ashnod's Altar.
False Demise returns Iridescent Drake to the battlefield.
Iridescent Drake returns False Demise to the battlefield attached to itself.
Repeat.

Infinite colorless mana

Ashnod's Altar

Sacrifice Sun Titan to Ashnod's Altar, generating {C}{C}.
False Demise triggers, returning Sun Titan to the battlefield.
Sun Titan triggers, returning False Demise to the battlefield.

Infinite death triggers

Infinite sacrifice triggers

Sun Titan

Sacrifice Iridescent Drake to Phyrexian Altar.
False Demise returns Iridescent Drake to the battlefield.
Iridescent Drake returns False Demise to the battlefield attached to itself.
Repeat.

Infinite colored mana

Phyrexian Altar

Sacrifice Sun Titan to Phyrexian Altar, generating {1} of any color.
False Demise triggers, returning Sun Titan to the battlefield.
Sun Titan triggers, returning False Demise to the battlefield.

Sacrifice Sun Titan to Altar of Dementia, milling the top 6 of target player's library.
False Demise triggers, returning Sun Titan to the battlefield.
Sun Titan triggers, returning False Demise to the battlefield.

Activate Blasting Station by tapping it and sacrificing Danitha.
When Danitha dies, False Demise triggers, returning Danitha from your graveyard to the battlefield tapped.
When Danitha enters the battlefield, it and Blasting Station trigger.
Resolve the Blasting Station trigger, untapping it.
Resolve the Danitha trigger, returning False Demise from your graveyard to the battlefield attached to Danitha.
Resolve the Blasting Station ability from step 1, dealing 1 damage to any target.
Repeat.

Infinite damage

Danitha, Benalia's Hope

Blasting Station

Activate Yahenni by sacrificing Brotherhood Outcast.
When Brotherhood Outcast dies, False Demise triggers, returning Brotherhood Outcast from your graveyard to the battlefield.
When Brotherhood Outcast enters the battlefield, it triggers, returning False Demise from your graveyard to the battlefield attached to Brotherhood Outcast.
Resolve the Yahenni ability.
Repeat.

Brotherhood Outcast

Yahenni, Undying Partisan

During your upkeep, activate Mairsil by sacrificing it and discarding your hand, adding {U}{U}{U}.
Mairsil dies, triggering False Demise, returning Mairsil from your graveyard to the battlefield.
Activate Mairsil using Hakim's first ability by paying {U}{U}, returning False Demise from your graveyard to the battlefield attached to Mairsil.
Repeat.

Combos with "False Demise"