Cauldron of Essence, Dross Scorpion, Phyrexian Altar, and Marionette Master

Prerequisites

• Cauldron of Essence on the battlefield
• Dross Scorpion on the battlefield
• Phyrexian Altar on the battlefield
• Marionette Master in the graveyard
• available

Steps

1. Activate Cauldron of Essence by paying , tapping it and sacrificing another creature
2. When the creature dies, Cauldron of Essence triggers, and Dross Scorpion triggers if the creature was an artifact
3. Resolve the Cauldron of Essence trigger, causing you to gain 1 life and each opponent to lose 1 life
4. Resolve the Dross Scorpion trigger, if applicable, untapping an artifact
5. Resolve the Cauldron of Essence ability from step 1, returning Marionette Master from your graveyard to the battlefield
6. When Marionette Master enters, it triggers, creating three creature tokens
7. Activate Phyrexian Altar three times by sacrificing Marionette Master and two tokens, adding
8. When Marionette Master and the tokens die, Dross Scorpion triggers three times, untapping Cauldron of Essence and two other artifacts
9. Repeat

Results

• Infinite ETB
• Infinite LTB
• Infinite death triggers
• Infinite lifegain
• Infinite lifegain triggers
• Infinite lifeloss
• Infinite mana artifacts you control can produce
• Infinite sacrifice triggers
• Infinite untap of artifacts you control