How can you create a combo with Myr Welder, Umbral Mantle, Empowered Autogenerator?
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[START OF COMBO]This combo can be formed with Myr Welder, Umbral Mantle, Empowered Autogenerator

Color identity: C
Mana cost: {3}
Steps:
  1. Activate Myr Welder using Empowered Autogenerator's ability by tapping it, putting a charge counter on Myr Welder and adding one mana of any color for each charge counter on Myr Welder.
  2. Activate Myr Welder by paying {3} and untapping it, giving it +2/+2 until end of turn.
  3. Repeat.[END OF COMBO STEPS]

Result:
  - Infinite charge counters on Myr Welder
  - Infinite colored mana
  - Infinitely large Myr Welder until end of turn[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Myr Welder must be on the battlefield
  - Umbral Mantle must be on the battlefield
  - Empowered Autogenerator must be exiled
  - Umbral Mantle attached to Myr Welder.
  - Myr Welder does not have summoning sickness.
[END OF COMBO PREREQUISITES]
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