The only issue is that he isn't using his deck, but rather one that belonged to a kid named Luke, who had a deck that only had one spell card in it
Mega Diancie ex Everyday Wonders #087 Card Type Pokmon Element Psychic Stage Basic HP 170 Weakness Metal Retreat Cost 1 Evolves From - Pokmon Diancie Artist Brilliant Storm 40+ This attack does 20 more damage for each [P] Energy attached to all of your Pokmon
Heres an outline: 5-8 removal spells 4-6 card draw spells (including flashback cards) 4-6 payoffs (Sahagin, Shantotto, etc.) 2-3 other creatures (Wyvern, Ice Flan, etc.) 17 lands The deck is fairly simple to put together, and really doesnt want much outside of removal, card draw, and payoffs
If you dont have enough Hourglasses, you can reset the pack timer using Poke Gold, but this isn't recommended, as Poke Gold is a much rarer currency in Pokemon TCG Pocket and is primarily obtained through microtransactions
This Deck features the cards from the "Lightsworn" archetype which Ishizu didn't used in the Yu-Gi-Oh
I mean, where you really going to play that Gaia the Dragon Champion