Every land you tap pays double, so you skip the early game and land your huge spells way ahead of schedule.
Sets your commander and theme, then adds about 25 cards that fit plus 20 lands. You fill in the rest.
The top 40 of 1140 cards that fit

#1,659$3.46Adam Vehige

#9,576$4.55Jae Lee

#5,839$2.70Uta Natsume

#3,473$0.34

#442$302.69Filip Burburan

#3,790$0.15Cristi Balanescu

#7,276$0.40Josiah "Jo" Cameron

#10,932$0.38

#13,305$0.34Justin Sweet

#10,052$0.17Douglas Shuler

#16,090$0.26Jerry Tiritilli

#879$0.49Karl Kopinski

#3,924$0.31Zara Alfonso

#1,019$27.95Yoshitaka Amano

#2,134$34.13Craig J Spearing

#13,222$0.21Michele Giorgi

#2,473$1.35Heonhwa

#6,802$3.79Wayne Reynolds

#7,329$0.24Chris Seaman

#9,973$0.29Andrey Kuzinskiy

#1,237$0.28John Avon

#6,591$7.96Tyler Jacobson

#23,284$3.49Alix Branwyn

#10,176$0.14Dan Murayama Scott

#504$1.98Darrell Riche

#20,085$0.26

#2,987$16.43

#1,902$1.06Lars Grant-West

#2,373$0.23Jason A. Engle

#14,396$0.16Yongjae Choi

#5,547$0.25Pete Venters

#2,646$2.18Brigitte Roka & Clifton Stommel

#18,403$0.22Uriah Voth

#2,091$0.21Nils Hamm

#966$1.16Ryan Riller

#7,133$0.35

#9,932$0.25Johannes Voss

#6,866$46.38John Avon

#988$3.98Daarken

#2,240$0.44Scott Murphy