Infinitely large creatures you control until end of turnInfinite colored manaInfinite charge counters on a permanentInfinite proliferateInfinitely large creature until end of turnInfinite untap of creatures you controlInfinite mana creatures you control can produce
How it works
Activate Tromell by paying 1 and tapping it, causing you to put at least five charge counters on Gemstone Array.
Activate Gemstone Array five times by removing five charge counters from it, adding 3.
Activate Seedcradle Witch by paying 2, untapping Tromell and giving it +3/+3 until end of turn
Repeat.
This intricate engine relies on Tromell, Seymour's Butler to turn your board into a multiplying battery, leveraging its tap ability to trigger explosive proliferation based on the creatures entering the battlefield. Gemstone Array acts as your mana converter, storing up charge counters that can be continuously cashed in for the exact colored mana you need. Finally, Seedcradle Witch untaps Tromell and pumps its stats, fueling the loop and letting you repeat the entire cycle to generate infinite mana, infinitely large creatures, and boundless counters.