So, when choosing trainer cards, ensure that out of 25 trainer cards, you have 5-8 cards, making it possible to take cards from the deck/discard if you have a few useful cards in your hand
Usually, this is through the effect of Hand of Nephthys
He has a strong desire to not hurt anyone, thus he even shows mercy against enemies who are at a disadvantage, such as when he offered a recuperating Sora the chance to surrender during their match after holding back against him on purpose despite knowing that he belongs to Duel Academy
The Ruinous Powers deck (red/blue/black): Abaddon the Despoiler and Be'lakor, the Dark Master Forces of the Imperium (white/blue/black): Inquisitor Greyfax and Marneus Calgar, Ultramarines Chapter Master The Tyranid Swarm (green/blue/red): The Swarmlord and Magus Lucca Kane Necron Dynasties (black): Szarekh, the Silent King, and Imotekhk, the Stormlord You can get hold of the 100-card commander decks when they release on October 7, and there will also be three crossover Secret Lair releases featuring yet more Magic cards from Games Workshop's settings between October 17 and November 14
You should use one or the other as best fits your preferences