Activate Gumato by tapping it, adding {G}{G}{G}
Activate Gumato by paying {3} and untapping it, giving it +2/+2 until end of turn.
Repeat.

Infinitely large creature until end of turn

Umbral Mantle

Gumato

Cause Gumato to become an artifact using Memnarch.
Activate Gumato by tapping it, adding {G}{G}{G}
Activate Voltaic Construct by paying {2}, untapping Gumato.
Repeat from step 2.

Infinite green mana

Infinite untap of artifact creatures you control

Voltaic Construct

Memnarch

Activate Gumato by tapping it, adding {G}{G}{G}
Activate Gumato using Gilder Bairn's ability by paying {2}{G/U} and untapping it, doubling the counters on target permanent.
Repeat.

Infinite proliferate

Gilder Bairn

Agatha's Soul Cauldron

Activate Staff of Domination's third ability by paying {3}, targeting Gumato.
Ertha Jo triggers, copying Staff of Domination's ability, targeting Gumato.
Resolve the first Staff of Domination ability, untapping Gumato.
Holding priority, activate Gumato by tapping it, adding {G}{G}{G}
Resolve the second Staff of Domination ability, untapping Gumato.
Activate Gumato by tapping it, adding {G}{G}{G}
Activate Staff of Domination's first ability by paying {1}, untapping it.
Repeat.

Infinite card draw

Infinite draw triggers

Infinite lifegain

Infinite lifegain triggers

Infinite mana creatures you control can produce

Infinite untap of creatures you control

Ertha Jo, Frontier Mentor

Staff of Domination

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