Marath, Will of the Wild + Ozolith, the Shattered Spire + Cryptic Trilobite
Marath, Will of the Wild
Ozolith, the Shattered Spire
Cryptic Trilobite
Infinite colorless mana that can only be spent to activate abilitiesInfinite creature tokensInfinite damageInfinite creature ETBInfinite +1/+1 counters on creatures you control
How it works
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 CC 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.
This brilliant loop relies on Ozolith, the Shattered Spire to break the math of counter generation, turning Marath, Will of the Wild's flexible activated ability into a net-positive engine. By using Marath's ability to pump Cryptic Trilobite while utilizing Ozolith's replacement effect to add extra counters, Cryptic Trilobite can then crack its own counters for restricted mana to keep the cycle going. Once you have built up an infinite supply of counters and ability-only mana between them, you can easily pivot Marath to generate infinite creature tokens, infinite damage, and infinite growth for your entire board.