Encroaching Mycosynth + Mirrodin Besieged + Phyrexian Altar + Shrieking Drake

Mana needed: {U}

U identity

Commander legal

The 4 combo pieces

What must be in place

"Mirran" chosen with Mirrodin Besieged.

How to execute it

  1. Cast Shrieking Drake by paying {U}.
  2. Mirrodin Besieged triggers, creating a 1/1 Myr artifact creature token.
  3. Activate Phyrexian Altar by sacrificing a Myr, adding {U}.
  4. Shrieking Drake enters the battlefield, returning itself to its owner's hand.
  5. Repeat.

What the combo produces