How can you create a combo with Encroaching Mycosynth, Mirrodin Besieged, Phyrexian Altar, Shrieking Drake?
user
[START OF COMBO]This combo can be formed with Encroaching Mycosynth, Mirrodin Besieged, Phyrexian Altar, Shrieking Drake

Color identity: U
Mana cost: {U}
Steps:
  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.[END OF COMBO STEPS]

Result:
  - Infinite death triggers
  - Infinite enters the battlefield
  - Infinite leaves the battlefield
  - Infinite sacrifice triggers
  - Infinite storm count[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Encroaching Mycosynth must be on the battlefield
  - Mirrodin Besieged must be on the battlefield
  - Phyrexian Altar must be on the battlefield
  - Shrieking Drake must be in your hand
  - "Mirran" chosen with Mirrodin Besieged.
[END OF COMBO PREREQUISITES]
assistant