Every Servo grows with +1/+1 counters, and doublers and proliferate turn tiny helpers into real threats.
Sets your commander and theme, then adds about 25 cards that fit plus 20 lands. You fill in the rest.
The top 40 of 816 cards that fit

#7,383$0.25

#6,382$0.33

#5,237$1.90Raymond Swanland

#17,677$0.11

#7,889$0.35Jaime Jones

#15,584$0.95

#7,463$5.99Heonhwa

#1,225$6.02Maël Ollivier-Henry

#3,139$4.43John Tedrick

#1,127$5.77

#295$0.43Aleksi Briclot

#4,956$2.29Jason Kiantoro

#1,628$3.22Chase Stone

#2,733$0.29Aaron J. Riley

#7,125$8.75InHyuk Lee

#917$25.23

#2,845$25.57Gabor Szikszai

#1,582$34.03

#4,042$0.95Dominik Mayer

#5,082$0.35Izzy

#1,522$0.30Adam Paquette

#5,975$4.48Zoltan Boros

#9,284$0.89Francis Tneh

#7,532$0.38

#190$29.50Richard Wright

#1,250$33.86Richard Luong

#17,678$0.63Aleksi Briclot

#5,180$0.57Colin Boyer

#10,061$1.29Ryan Yee

#186$2.03Jim Nelson

#6,580$0.13Jonas De Ro

#17,979$0.05Clint Cearley

#3,301$8.13Johan Grenier

#14,962$0.33Howard Lyon

#13,150$0.24James Ryman

#3,696$2.39Danny Miller

#16,179$0.87Julie Bell

#2,515$6.16Kevin Sidharta

#14,716$0.32Jeff Miracola

#1,659$3.46Scott M. Fischer