A thundering herd of dinosaurs charges in with the Tarrasque, and every attack trigger goes off at once.
Sets your commander and theme, then adds about 25 cards that fit plus 20 lands. You fill in the rest.
The top 40 of 128 cards that fit

#3,966$0.14Lars Grant-West

#12,309$29.08Wero Gallo

#6,710$4.86Kev Walker

#1,773$36.88Loïc Canavaggia

#1,637$10.67Mónica Robles Corzo

#459$1.02Johann Bodin

#2,256$1.28Nicholas Gregory

#2,822$0.15Kemonomichi

#1,956$1.48Néstor Ossandón Leal

#16,460$0.30Jonathan Kuo

#7,254$0.48Stephanie Cheung

#6,177$0.22Wayne Reynolds

#643$2.96Svetlin Velinov

#2,956$2.89Simon Dominic

#1,127$5.77Chris Rahn

#21,096$5.33Aleksi Briclot

#2,421$0.54Kev Walker

#8,570$0.13Tomasz Jedruszek

#5,595$29.88Villarrte

#1,076$29.04Lars Grant-West

#2,646$2.18Ryota Murayama

#4,475$0.51Lucas Graciano

#3,325$2.87Crystal Sully

#20,487$0.34Antonio José Manzanedo

#5,678$8.40

#2,390$0.26Sidharth Chaturvedi

#6,055$0.21Eric Deschamps

#1,048$3.69Chris Rahn

#7,089$0.32Steve Argyle

#5,890$0.45Irina Nordsol

#6,613$1.09Caio Monteiro

#6,511$1.47Oleksandr Kozachenko

#11,004$0.20Fang Xinyu

#2,865$0.83Ryan Pancoast

#9,590$0.91Andrew Mar

#11,943$0.27Tyler Jacobson

#1,488$8.69Simon Dominic

#18,736$5.60Michal Ivan

#3,081$5.96Tuan Duong Chu

#23,741$0.32Wero Gallo