Cast Quasiduplicate by paying {1}{U}{U}, creating a token copy of Specimen Collector.
The Specimen Collector token enters the battlefield, creating a 1/1 Squirrel and a 0/3 Crab creature token.
Activate Ashnod's Altar by sacrificing the nontoken Specimen Collector, adding {C}{C}.
Specimen Collector dies, creating a token copy of the Specimen Collector token.
Repeat from step 2.

Infinite colorless mana

Infinite creature tokens

Infinite death triggers

Infinite ETB

Infinite LTB

Infinite sacrifice triggers

Specimen Collector

Quasiduplicate

Ashnod's Altar

Cast Quasiduplicate by paying {1}{U}{U}, creating a token copy of Specimen Collector.
The Specimen Collector token enters the battlefield, creating a 1/1 Squirrel and a 0/3 Crab creature token.
Activate Phyrexian Altar by sacrificing the nontoken Specimen Collector, adding one mana of any color.
Specimen Collector dies, creating a token copy of the Specimen Collector token.
Repeat from step 2.

Infinite colored mana

Phyrexian Altar

Cast Quasiduplicate by paying {1}{U}{U}, creating a token copy of Specimen Collector.
When the Specimen Collector token enters the battlefield, its first ability triggers, creating a 1/1 Squirrel and a 0/3 Crab creature token.
Activate Altar of Dementia by sacrificing the nontoken Specimen Collector.
When Specimen Collector dies, its second ability triggers, creating a token copy of the Specimen Collector token.
Repeat from step 2.
Resolve all Altar of Dementia abilities, causing any number of players to mill infinite cards.

Infinite mill

Infinite self-mill

Altar of Dementia

Cast Quasiduplicate by paying {1}{U}{U}, creating a token copy of Specimen Collector.
When the Specimen Collector token enters the battlefield, its first ability and Blasting Station trigger.
Resolve the Specimen Collector trigger, creating a 1/1 Squirrel and a 0/3 Crab creature token.
When the Squirrel and Crab enter the battlefield, Blasting Station triggers twice.
Resolve the Blasting Station triggers from step 2 and step 4, untapping it.
Activate Blasting Station by tapping it and sacrificing the nontoken Specimen Collector.
When Specimen Collector dies, its second ability triggers, creating a token copy of the Specimen Collector token.
Repeat from step 2.
Resolve all Blasting Station abilities, dealing infinite damage to any target(s).

Infinite damage

Blasting Station

Cast the artifact from your graveyard by paying {0}.
Displacer Kitten triggers, blinking Muldrotha.
Activate Sarcatog by sacrificing the artifact.
Repeat.

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