Activate Ashnod's Altar by sacrificing Whirler Rogue, adding {C}{C}.
When Whirler Rogue dies, Nim Deathmantle triggers, causing you to pay {4} to return Whirler Rogue from your graveyard to the battlefield and attach Nim Deathmantle to it.
When Whirler Rogue enters, it triggers, creating two creature tokens.
Activate Ashnod's Altar by sacrificing a creature token, adding {C}{C}.
Repeat.

Infinite colorless mana

Infinite creature tokens

Infinite death triggers

Infinite creature ETB

Infinite creature LTB

Infinite creature sacrifice triggers

Nim Deathmantle

Ashnod's Altar

Whirler Rogue

Activate Whirler Rogue by paying {1}{U}, blinking it.
When Whirler Rogue enters the battlefield, it and Deadeye Navigator's soulbond ability trigger.
Resolve the Deadeye Navigator trigger, repairing it and Whirler Rogue
Resolve the Whirler Rogue trigger, creating two artifact tokens.
Activate Urza's first ability twice by tapping two artifacts, adding {U}{U}.
Repeat.

Infinite artifact ETB

Infinite tapped artifact tokens

Infinite tapped creature tokens

Urza, Lord High Artificer

Deadeye Navigator

Activate Eldrazi Displacer by paying {2}{C}, blinking Whirler Rogue.
When Whirler Rogue enters, it triggers, creating two creature tokens.
Activate Ashnod's Altar by sacrificing two creature tokens, adding {C}{C}{C}{C}.
Repeat.

Infinite blinking

Infinite blinking of most creatures

Eldrazi Displacer

Activate Eldrazi Displacer by paying {2}{C}, blinking Whirler Rogue.
Whirler Rogue enters the battlefield, creating two 1/1 Thopter artifact creature tokens.
Activate Krark-Clan Ironworks twice by sacrificing both Thopters, adding {C}{C}{C}{C}.
Repeat.

Krark-Clan Ironworks

Activate Whirler Rogue by paying {1}{U}, blinking itself.
Whirler Rogue enters the battlefield, triggering itself and Deadeye Navigator's soulbond ability.
Resolve the Whirler Rogue trigger, creating two 1/1 Thopter artifact creature tokens.
Resolve the Deadeye Navigator trigger, repairing it and Whirler Rogue.
Activate Phyrexian Altar by sacrificing both Thopters, adding {1}{U}.
Repeat.

Phyrexian Altar

Activate Emiel by paying {3}, blinking Whirler Rogue.
Whirler Rogue enters the battlefield, creating two 1/1 Thopter artifact creature tokens.
Activate Ashnod's Altar twice by sacrificing both Thopters, adding {C}{C}{C}{C}.
Repeat.

Emiel the Blessed

Activate Emiel by paying {3}, blinking Whirler Rogue.
Whirler Rogue enters the battlefield, creating two 1/1 Thopter artifact creature tokens.
Activate Krark-Clan Ironworks twice by sacrificing both Thopters, adding {C}{C}{C}{C}.
Repeat.

Combos with "Whirler Rogue"