Every end step your opponents pick their poison: lose a real creature or bleed for it.
Sets your commander and theme, then adds about 25 cards that fit plus 20 lands. You fill in the rest.
The top 40 of 215 cards that fit

#2,985$5.04Brom

#23,724$4.81Aleksi Briclot

#794$8.07Chris Rallis

#3,058$2.26Tiffany Turrill

#21,554$698.70

#1,578$0.35Daarken

#1,086$4.52Andrew Mar

#31,621$0.29

#1,392$0.59Zack Stella

#1,987$18.15Ryan Pancoast

#8,067$2.18

#6,736$0.55Dominik Mayer

#22,938$0.19

#580$19.27Tony Szczudlo

#1,146$1.03Helge C. Balzer

#8,882$0.34Olivier Bernard

#20,094$0.22

#4,825$1.48

#14,663$0.18Ben Thompson

#19,856$0.21Jeffrey R. Busch

#1,024$14.51Kathleen Neeley & AndWorld Design

#11,151$0.14Franz Vohwinkel

#2,403$5.07Kieran Yanner

#22,336$0.17

#10,027$0.14Ironbrush

#4,790$0.87Psydrian

#1,980$0.34

#725$19.08

#13,510$0.09Dave Kendall

#12,433$0.28Trevor Claxton

#1,371$0.32Jason Chan

#17,023$0.21Alexandre Honoré

#2,569$0.35Caio Monteiro

#20,194$0.06

#1,401$2.77Dmitry Burmak

#1,164$3.09Wylie Beckert

#15,302$0.29Rafal Wechterowicz (Too Many Skulls)

#6,833$0.18

#1,296$2.90David Palumbo

#16,623$0.20Filip Burburan