the front side of Myr Welder
the back of a classic MtG card
the front side of Biotransference
the back of a classic MtG card
the front side of Empowered Autogenerator
the back of a classic MtG card
the front side of Merrow Grimeblotter
the back of a classic MtG card

Color Identity: U, B

Initial Card State

  1.  Myr Welder and Biotransference on the battlefield.
  2.  Empowered Autogenerator and Merrow Grimeblotter in exile (exiled by Myr Welder).

Notable Prerequisites

  1. Myr Welder does not have summoning sickness.

Mana Needed

  1. one generic mana (at most) available.

Steps

  1. Activate Myr Welder using Empowered Autogenerator's ability by tapping it, putting a charge counter on Myr Welder and adding one blue mana or one black mana for each charge counter on Myr Welder.
  2. Activate Myr Welder using Merrow Grimeblotter's ability by paying one generic manaone blue or black mana and untapping it, giving target creature -2/-0 until end of turn.
  3. Repeat.

Results

  1. Infinite charge counters on a permanent.
  2. Infinite colored mana.
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