Cast Chancellor of the Forge by paying {4}{R}{R}{R}.
When Chancellor of the Forge enters the battlefield, it and Cloudstone Curio trigger.
Resolve the Cloudstone Curio trigger, choosing to return nothing to your hand from the battlefield.
Resolve the Chancellor of the Forge trigger, creating a number of 1/1 Phyrexian Goblin creature tokens with haste equal to the number of creatures you control.
When the Phyrexian Goblins enter the battlefield, Cloudstone Curio triggers that many times.
Resolve the first Cloudstone Curio trigger, returning Chancellor of the Forge to your hand from the battlefield.
Resolve all remaining Cloudstone Curio triggers, choosing to return nothing to your hand from the battlefield.
Activate Skirk Prospector seven times by sacrificing seven Phyrexian Goblins, adding seven {R}.
Repeat.
If you control at least seven creatures when Chancellor of the Forge enters the battlefield, this combo will net infinite red mana.

Infinite creature tokens with haste

Infinite death triggers

Infinite creature ETB

Infinite creature LTB

Infinite red mana

Infinite creature sacrifice triggers

Infinite storm count

Cloudstone Curio

Skirk Prospector

Chancellor of the Forge

Cast Chancellor of the Forge by paying {4}{R}{R}{R}.
When Chancellor of the Forge enters the battlefield, it and Cloudstone Curio trigger.
Resolve the Cloudstone Curio trigger, choosing to return nothing to your hand from the battlefield.
Resolve the Chancellor of the Forge trigger, creating a number of 1/1 Phyrexian Goblin creature tokens with haste equal to the number of creatures you control.
When the Phyrexian Goblins enter the battlefield, Cloudstone Curio triggers that many times.
Resolve the first Cloudstone Curio trigger, returning Chancellor of the Forge to your hand from the battlefield.
Resolve all remaining Cloudstone Curio triggers, choosing to return nothing to your hand from the battlefield.
Activate Phyrexian Altar seven times by sacrificing seven Phyrexian Goblins, adding {4}{R}{R}{R}.
Repeat.
If you control at least seven creatures when Chancellor of the Forge enters the battlefield, this combo will net infinite colored mana.

Infinite colored mana

Phyrexian Altar

Activate Phyrexian Altar twice by sacrificing Chancellor of the Forge and Slimefoot and Squee, adding two mana in any combination of {B}, {R} or {G}.
Activate Slimefoot and Squee by paying {1}{B}{R}{G} and sacrificing a Saproling, returning it and Chancellor of the Forge from your graveyard to the battlefield.
When Chancellor of the Forge and Slimefoot and Squee enter the battlefield, their abilities trigger.
Resolve the Slimefoot and Squee trigger, creating a 1/1 Saproling creature token.
Resolve the Chancellor of the Forge trigger, creating at least three 1/1 Phyrexian Goblin creature tokens with haste.
Activate Phyrexian Altar four times by sacrificing two Phyrexian Goblins, Chancellor of the Forge and Slimefoot and Squee, adding {1}{B}{R}{G}.
Repeat from step 2.

Slimefoot and Squee

Cast Chancellor of the Forge by paying {4}{R}{R}{R}.
When Chancellor of the Forge enters the battlefield, it and Cloudstone Curio trigger.
Resolve the Cloudstone Curio trigger, choosing to return nothing to your hand from the battlefield.
Resolve the Chancellor of the Forge trigger, creating a number of 1/1 Phyrexian Goblin creature tokens with haste equal to the number of creatures you control.
When the Phyrexian Goblins enter the battlefield, Cloudstone Curio triggers that many times.
Resolve the first Cloudstone Curio trigger, returning Chancellor of the Forge to your hand from the battlefield.
Resolve all remaining Cloudstone Curio triggers, choosing to return nothing to your hand from the battlefield.
Activate Thermopod seven times by sacrificing seven Phyrexian Goblins, adding seven {R}.
Repeat.
If you control at least seven creatures when Chancellor of the Forge enters the battlefield, this combo will net infinite red mana.

Combos with "Chancellor of the Forge"