Orvar, the All-Form, Specimen Collector, and Phyrexian Altar

Prerequisites

• Orvar, the All-Form on the battlefield
• Specimen Collector on the battlefield
• Phyrexian Altar on the battlefield
• You have an instant or sorcery card in hand that can target Specimen Collector with the mana to cast it

Steps

1. Cast any instant or sorcery spell from your hand by paying its mana cost, targeting Specimen Collector
2. Orvar's first ability triggers, creating a token copy of Specimen Collector
3. The Specimen Collector token enters the battlefield, creating a 1/1 Squirrel and a 0/3 Crab creature token
4. Activate Phyrexian Altar by sacrificing the nontoken Specimen Collector, adding one mana of any color
5. The nontoken Specimen Collector dies, creating a token copy of the Specimen Collector copy
6. Repeat from step 3, sacrificing one of the two Specimen Collector copies instead

Results

• Infinite colored mana
• Infinite creature tokens
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers