关于GBA上游戏王Mod的问题

Yu-gi-oh games have always been a mixed bag. Some have good stories, but the card game mechanics are different from the real thing i.e. Sacred Cards/Reshef. Many DO have the card game, but little or no story at all i.e. Eternal Duelist Soul/World Championship Tournament 2004. And that is really all I've wanted from a Yu-gi-oh game: the actual card game, coupled with a halfway decent story and gameplay. For me, on the Game Boy Advance, 7 Trials to Glory & GX Duel Academy are the only ones that come close (but not quite). And with the release of the Early Days Collection, that led me to wonder: creating things from scratch is always difficult and time-consuming, but what about mixing-and-matching different aspects of the existing games themselves? Like, for example, taking the card game mechanics from Stairway of the Destined Duel and inserting that into the story and gameplay of The Sacred Cards? Would Early Days Collection help with that, having all these games released under one "banner", as it were?

Would Early Days Collection help with that, having all these games released under one "banner", as it were?

Not really. EDC is just roms and an emulator.
To achieve what you want, decompilations of both games would be the best thing that could happen to make it plausible.

Collectible card game AI is one of the harder problems in computing and as such messing with things too much will break it. This is also why you tend not to see many hacks for things.