At the beginning of your combat phase, Helm of the Host triggers, creating a token copy of Myr Galvanizer with haste.
Activate Palladium Myr by tapping it, adding {C}{C}.
Activate a Myr Galvanizer by paying {1} and tapping it, untapping all other Myr you control.
Repeat from step 2.

Infinite colorless mana

Infinite untap of Myr you control

Myr Galvanizer

Palladium Myr

Helm of the Host

At the beginning of your combat phase, Helm of the Host triggers, creating a nonlegendary token copy of Omarthis with haste.
Put a +1/+1 counter on the Omarthis token or another colorless creature you control.
The nontoken Omarthis triggers, putting a +1/+1 counter on itself.
The Omarthis token triggers, putting a +1/+1 counter on itself.
Repeat from step 3.

Infinite +1/+1 counters on a creature token with haste

Infinite +1/+1 counters on a creature

Omarthis, Ghostfire Initiate

Forsaken Monument

At the beginning of combat on your turn, Helm of the Host triggers, creating a token copy of Coretapper with haste.
Activate the token Coretapper's first ability by tapping it, putting a charge counter on Magistrate's Scepter.
Activate the token Coretapper's second ability by sacrificing it, putting two charge counters on Magistrate's Scepter.
Activate Magistrate's Scepter's second ability by tapping it and removing three charge counters from it, causing you to take an extra turn after this one.
Repeat each turn.

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