How can you create a combo with Gyre Engineer, Umbral Mantle, Biomancer's Familiar?
user
[START OF COMBO]This combo can be formed with Gyre Engineer, Umbral Mantle, Biomancer's Familiar

Color identity: GU
Mana cost: 
Steps:
  1. Activate Gyre Engineer by tapping it, adding {G}{U}.
  2. Activate Gyre Engineer by paying {1} and untapping it, giving itself +2/+2 until end of turn.
  3. Repeat.[END OF COMBO STEPS]

Result:
  - Infinitely large Gyre Engineer until end of turn
  - Infinite green mana
  - Infinite blue mana[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - All permanants must be on the battlefield
  - Umbral Mantle attached to Gyre Engineer.
  - Gyre Engineer does not have summoning sickness.
[END OF COMBO PREREQUISITES]
assistant