Dross Scorpion + Myr Battlesphere + Phyrexian Altar + Vat of Rebirth

Mana needed: {2}{B}

B identity

Commander legal

The 4 combo pieces

What must be in place

Vat of Rebirth has at least four oil counters on it.

How to execute it

  1. Activate Vat of Rebirth by paying {2}{B}, tapping it and removing four oil counters from it, returning Myr Battlesphere from your graveyard to the battlefield.
  2. Myr Battlesphere enters the battlefield, creating four 1/1 Myr artifact creature tokens.
  3. Activate Phyrexian Altar four times by sacrificing Myr Battlesphere and three Myr tokens, adding {3}{B}.
  4. Myr Battlesphere and the Myrs die, triggering Vat of Rebirth and Dross Scorpion four times.
  5. Resolve all Dross Scorpion triggers, untapping Vat of Rebirth and up to three other artifacts you control.
  6. Resolve all Vat of Rebirth triggers, putting four oil counters on it.
  7. Repeat.

What the combo produces