Activate Workhorse three times by removing three +1/+1 counters from it, adding CCC.
Cast Crystalline Crawler by paying 4, using at least one colored mana if available.
If Crystalline Crawler has a +1/+1 counter on it, activate its first ability by removing a +1/+1 counter from it, adding 1.
Activate Raucous Entertainer by paying 1 and tapping it, putting a +1/+1 counter on Crystalline Crawler, Workhorse and any other creature you control the entered the battlefield this turn.
Activate Workhorse by removing a +1/+1 counter from it, adding C.
Activate Crystalline Crawler's first ability by removing a +1/+1 counter from it, adding .
Activate Pemmin's Aura's first ability by paying , untapping Raucous Entertainer.
Repeat from step 5.
This clever loop turns the modular, self-sacrificing nature of Workhorse and Crystalline Crawler into an engine for infinite growth, sustained by the untap utility of Pemmin's Aura. By spending {1} to activate Raucous Entertainer, you distribute fresh +1/+1 counters to creatures that entered the turn, replenishing the counters that Workhorse and Crystalline Crawler cheerfully strip away for mana. Pemmin's Aura ties the whole sequence together by translating that generated mana into endless untaps for Raucous Entertainer, letting you scale your board indefinitely.