Specimen Collector + Cackling Counterpart + Altar of Dementia
Specimen Collector
Cackling Counterpart
Altar of Dementia
Requires
Specimen Collector must be on the battlefield.
Cackling Counterpart must be in hand.
Altar of Dementia must be on the battlefield.
Mana needed: 
Steps
- Cast Cackling Counterpart by paying , 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.
Results
Infinite creature tokens. Infinite death triggers. Infinite ETB. Infinite LTB. Infinite mill. Infinite sacrifice triggers. Infinite self-mill.
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