Cast cheap instants and sorceries, surveil them into a growing pile, and let the end step count them.
Sets your commander and theme, then adds about 25 cards that fit plus 20 lands. You fill in the rest.
The top 40 of 204 cards that fit

#4,143$12.77Benangbajastudio

#11,154$0.38

#2,202$19.64Babs Webb

#15,301$0.17Dmitry Burmak

#1,851$5.75Vincent Proce

#2,403$5.07Kieran Yanner

#23,061$0.32

#2,296$1.91Izzy

#7,459$0.30Jorge Gutierrez Garcia

#1,800$1.80

#617$0.30Alexandre Honoré

#7,476$0.25

#16,880$0.12

#8,293$0.90Josu Solano

#9,505$4.86Xavier Ribeiro

#19,822$0.41Daarken

#2,813$0.37Taras Susak

#13,597$0.21Izzy

#13,726$0.25David Palumbo

#7,298$0.09Lars Grant-West

#17,759$0.18Brent Hollowell

#1,801$3.14

#7,401$0.25Donato Giancola

#13,579$0.17Loïc Canavaggia

#9,757$0.17Ryan Barger

#1,905$0.36Heonhwa

#1,682$0.28John Thacker

#9,859$0.45

#3,897$0.34Chris Seaman

#13,132$0.20Fang Xinyu

#8,455$0.91Ben Wootten

#14,643$0.14Paul Scott Canavan

#6,180$0.30

#22,938$0.19

#5,776$0.17

#22,336$0.17

#4,870$4.69

#3,944$0.44Tomas Duchek

#5,546$3.59Andrea Piparo

#3,460$0.33Dan Mumford