Fill the lab with countered-up token minions, then harvest counters for cards while the swarm keeps growing.
Sets your commander and theme, then adds about 25 cards that fit plus 20 lands. You fill in the rest.
The top 40 of 800 cards that fit

#7,383$0.25

#5,237$1.90Raymond Swanland

#6,434$2.68Kim Dingwall

#1,304$1.23Evyn Fong

#5,579$3.99Chippy

#295$0.43Zoltan Boros & Gabor Szikszai

#1,522$0.30Adam Paquette

#3,031$0.46Raoul Vitale

#6,483$2.78Kev Walker

#6,382$0.33

#8,766$1.76Kev Walker

#5,839$2.70Aleksi Briclot

#7,837$0.35Cristi Balanescu

#4,042$0.95Dominik Mayer

#9,284$0.89Francis Tneh

#1,708$0.22Martina Pilcerova

#12,023$87.92Kev Walker

#3,763$1.41Chase Stone

#2,059$1.84D. Alexander Gregory

#7,532$0.38

#10,061$1.29Ryan Yee

#6,438$0.32Fajareka Setiawan

#2,256$1.28Nicholas Gregory

#2,101$0.37CatDirty

#1,855$0.31Xavier Ribeiro

#2,774$13.58Tuan Duong Chu

#7,381$6.16Leesha Hannigan

#8,487$0.57Ryan Pancoast

#8,441$0.87Lie Setiawan

#12,932$0.19Tyler Walpole

#14,591$0.14

#4,077$0.74Heonhwa

#17,677$0.11Winona Nelson

#3,500$1.51Izzy

#7,630$0.71Ron Spencer

#1,426$0.50Scott M. Fischer

#5,151$0.36Simon Dominic

#2,473$1.35Heonhwa

#240$8.50Alex Konstad

#9,445$0.29