Activate Marath by paying {1} and removing a +1/+1 counter from it, putting two +1/+1 counters on Marath.
Activate Marath by paying {1} and removing a +1/+1 counter from it, putting two +1/+1 counters on Cryptic Trilobite.
Activate Cryptic Trilobite's first ability by removing a +1/+1 counter from it, adding {C}{C} that can only be spent to activate abilities.
Repeat.
Once Cryptic Trilobite has infinite +1/+1 counters, you may remove them for infinite mana, then repeat step 1 to get infinite +1/+1 counters on Marath, which can then be used for Marath's other modes.

Infinite colorless mana that can only be spent to activate abilities

Infinite creature tokens

Infinite damage

Infinite creature ETB

Infinite +1/+1 counters on creatures you control

Marath, Will of the Wild

Ozolith, the Shattered Spire

Cryptic Trilobite

Activate Karn's Bastion by paying {4}, putting a charge counter on Lost Jitte and two +1/+1 counters on Cryptic Trilobite.
Activate Cryptic Trilobite's first ability twice by removing two +1/+1 counters from it, adding {C}{C}{C}{C} that can only be spent to activate abilities.
Activate Lost Jitte by removing a charge counter from it, untapping Karn's Bastion.
Repeat.

Infinite proliferate

Lost Jitte

Karn's Bastion

Activate Pheres-Band Tromper by tapping it, adding {1}.
Activate Pheres-Band Tromper by paying {1} and putting a -1/-1 counter on it, untapping it.
Pheres-Band Tromper triggers, putting two +1/+1 counters on it.
Repeat.

Infinite +1/+1 counters on a creature

Pheres-Band Tromper

Sinking Feeling

Cryptolith Rite

Activate Genku by paying {3}{W}{U}, putting two +1/+1 counters on each creature you control due to Ozolith, the Shattered Spire.
Activate Cryptic Trilobite's first ability twice by removing two +1/+1 counters from it, adding {C}{C}{C}{C} that can only be spent to activate abilities.
Activate Crystalline Crawler's first ability twice by removing two +1/+1 counters from it, adding {W}{U}.
Repeat.
Once you have infinite {C}, you may forego removing counters from Cryptic Trilobite.

Infinite +1/+1 counters on most creatures you control

Genku, Future Shaper

Crystalline Crawler

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