Last Laugh, Polyraptor, and Phyrexian Altar

Prerequisites

• Last Laugh on the battlefield
• Polyraptor on the battlefield
• Phyrexian Altar on the battlefield
• You control at least one additional creature
• You have the highest life total

Steps

1. Activate Phyrexian Altar by sacrificing another creature, adding one mana of any color
2. The creature dies, triggering Last Laugh, dealing 1 damage to each creature and each player
3. Polyraptor triggers, creating a token copy of itself
4. Activate Phyrexian Altar by sacrificing the damaged Polyraptor, adding one mana of any color
5. Repeat from step 2

Results

• Near-infinite colored mana
• Near-infinite damage
• Near-infinite death triggers
• Near-infinite ETB
• Near-infinite LTB
• Near-infinite sacrifice triggers