Copy Siegfried and steal others' best creatures, masquerading as the famed swordsman himself.
Sets your commander and theme, then adds about 25 cards that fit plus 20 lands. You fill in the rest.
The top 40 of 105 cards that fit

#3,435$0.90Rorubei

#5,785$0.47Yongjae Choi

#4,752$7.31Nino Is

#2,979$2.26Isabella Mazzanti

#14,974$1.75Mark Tedin

#4,305$0.33Tyler Jacobson

#13,172$0.32

#3,075$0.39

#2,409$0.57

#2,785$2.01

#5,674$1.23Miklós Ligeti

#393$5.08Igor Kieryluk

#8,895$0.22Titus Lunter

#2,077$0.26Daarken

#14,055$0.19

#924$3.28

#14,090$0.90Chris Seaman

#579$0.37John Avon

#13,585$0.32Andrew Mar

#18,060$0.75Ernanda Souza

#854$0.36

#10,933$0.32David Rapoza

#2,940$0.23Thomas M. Baxa

#22,735$2.60Wayne Wu

#1,747$5.68

#4,606$0.68

#1,572$17.55Richard Luong

#3,698$2.55Néstor Ossandón Leal

#664$1.64Heather Hudson

#2,850$2.57Yongjae Choi

#11,757$7.74Svetlin Velinov

#6,716$0.25AKAGI

#4,785$4.05Lucas Graciano

#6,806$1.78

#11,570$0.22Olena Richards

#12,777$0.87Anthony Palumbo

#3,398$5.62Julie Dillon

#2,588$0.28Daren Bader

#18,861$0.27

#10,764$0.21Joseph Meehan