Myr Welder + Farmstead Gleaner + Empowered Autogenerator
Myr Welder
Farmstead Gleaner
Empowered Autogenerator
Requires
Myr Welder must be on the battlefield.
Farmstead Gleaner must be in exile (exiled by Myr Welder).
Empowered Autogenerator must be in exile (exiled by Myr Welder).
Myr Welder does not have summoning sickness.
Mana needed: 
Steps
- 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.
- Activate Myr Welder using Farmstead Gleaner's ability by paying
and untapping it, putting a +1/+1 counter on Myr Welder. - Repeat.
Results
Infinite +1/+1 counters on Myr Welder. Infinite charge counters on Myr Welder. Infinite colored mana.
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Top Cards
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