Tatterkite, Dross Scorpion, Cauldron of Souls, and Phyrexian Altar

Prerequisites

• Tatterkite on the battlefield
• Dross Scorpion on the battlefield
• Cauldron of Souls on the battlefield
• Phyrexian Altar on the battlefield

Steps

1. Activate Cauldron of Souls by tapping it, giving Tatterkite persist until end of turn
2. Activate Phyrexian Altar by sacrificing Tatterkite, adding one mana of any color
3. Tatterkite dies, triggering its persist ability and Dross Scorpion
4. Resolve the Tatterkite trigger, returning it from your graveyard to the battlefield with no -1/-1 counters on it
5. Resolve the Dross Scorpion trigger, untapping Cauldron of Souls
6. Repeat

Results

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