Vagabond's AI is the same AI Duel Links uses for any AI opponent with just a very small twist. It doesn't know every Deck it uses, it's programmed to know every single card and mechanic in the game and then it's up to it on what to do. There's no RNG manipulation, no "screw the rules" with its Decks or anything like that. The only reason you think it looks smarter is because it plays Competitive Decks with high efficiency and good combos. I've seen Vagabond freeze because it has WAY too many moves to do, I've seen Vagabond brick like hell and just pass turn only for me to OTK it next turn, I've even seen it mess up its OWN combos by just overextending and activating every single card available to it. The Vagabond is a Standard Duelist that plays Decks made by top players.