Dross Scorpion + Elemental Mastery + Encroaching Mycosynth + Phyrexian Altar

UR identity

Commander legal

The 4 combo pieces

• Dross Scorpion
• Elemental Mastery
• Encroaching Mycosynth
• Phyrexian Altar

How to execute it

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 Phyrexian Altar by sacrificing an Elemental.
3. When the Elemental dies as an artifact due to Encroaching Mycosynth, Dross Scorpion triggers, untapping the creature with Elemental Mastery attached.
4. Repeat.

What the combo produces

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