Some markets value PSA 10 Mew Ex cards anywhere from $290 to $325
Luckily, there is also a crafting system implemented in the game, enabling players to acquire specific cards and complete that perfect deck build

Afterburner Expert Battle-Rattle Shaman Bile-Vial Boggart Boggart Cursecrafter Boggart Mischief Boggart Prankster Boneclub Berserker Boom Scholar Breeches, Eager Pillager Breeches, the Blastmaker Burnout Bashtronaut Cam and Farrik, Havoc Duo Champion of the Weird Chaos Spewer Courageous Goblin Crime Novelist Daretti, Rocketeer Engineer Deep Goblin Skulltaker Devoted Duelist Draconautics Engineer Dragonlord's Servant Dropkick Bomber Dynamite Diver Eclipsed Boggart Elder Auntie Enterprising Scallywag Fanatical Firebrand Fleem, Goben's Creation Frenzied Goblin Fugitive Codebreaker Gadget Technician Goblin Boarders Goblin Glasswright Goblin Maskmaker Goblin Smuggler Goblin Surveyor Goblin Tomb Raider Greasewrench Goblin Green Goblin Green Goblin, Revenant Gristle Glutton Grub's Command Grub, Notorious Auntie Grub, Storied Matriarch Gutsplitter Gang Guttersnipe Heirloom Auntie Hexing Squelcher Hobgoblin, Mantled Marauder Howlsquad Heavy Innocent Bystander Krenko, Baron of Tin Street Krenko, Mob Boss Lavaborn Goblins Magic Pot Molten-Core Maestro Mudbutton Cursetosser Nightblade Brigade Nu and Sumi, Career Criminals Picnic Ruiner Prowcatcher Specialist Raging Goblinoids Raging Redcap Reckless Lackey Redcap Gutter-Dweller Redcap Thief Redshift, Rocketeer Chief Retched Wretch Ruzic, Booed but Victorious Sanar, Innovative First-Year Sanar, Unfinished Genius Sandskitter Outrider

Clamavus is nuts in this deck, essentially doubling all the counters you have, while the Exocrine can pump out a ton of damage if timed correctly
Probably this Giant Cobra
They are a top-tier creature, and a well-piloted Cat deck is incredibly hard to stop in combat