In fact, this is probably why for most of the later series, Ash would leave behind all his Pokmon aside from Pikachu, as though he were starting a brand-new journey in each region, just like those who played the games
Each card a player draws from their deck represents a magical spell which can be used to their advantage in battle
Pain for All Turning any one of your creatures into a Boros Reckoner is a pretty cool effect, especially since there are so many good ways to exploit that effect, like Blasphemous Act or Star of Extinction
Power up with the original 3 forms of Yubel, or use the new Continuous Trap Card that lets you Fusion Summon a new Yubel Fusion Monster using your opponents monsters as Fusion Material
(Meanwhile, theyll never kill the Mutavault, since its not a creature most of the time)