Dross Scorpion, Elemental Mastery, Ashnod's Altar, and Biotransference

Prerequisites

• Dross Scorpion on the battlefield
• Elemental Mastery on the battlefield
• Ashnod's Altar on the battlefield
• Biotransference on the battlefield

Steps

1. Activate the creature with Elemental Mastery attached by tapping it, creating a number of 1/1 Elemental creature tokens with haste equal to its power
2. Activate Ashnod's Altar by sacrificing an Elemental
3. When the Elemental dies as an artifact due to Biotransference, Dross Scorpion triggers, untapping the creature with Elemental Mastery attached
4. Repeat

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite colorless mana
• Infinite creature tokens with haste