Keep in mind, even powerful cards have at least one weak side. You gotta force them to expose their weak sides by forcing their strong sides against the wall or their own cards. With Same/Plus this can lead to crazy combos in your favor. If you know which cards they use (easy with Open/3 Open), put your own card in a spot that makes their card powerful forcing them to expose a weak spot.

Swap is actually good because you have 1 good card and 4 crap cards while the opponent has 5 good cards. So unless they swap out your strongest card, typically you'll get 2 strong cards and they'll get your PoS card you can exploit. Also, the NPCs follow a strict AI. If you play one card, they'll always play the same card generally in the same spot so you can exploit their AI too.