How do we get red borders for these? I don't see seasonal upgrades? Is it with that new card system?

Playing the seasonal activities and unlocking cards. Hidden chests too. I’ve gotten a couple so far.

Yeah I dont get how these cards work lol

You have primary cards that give you buffs. They have Roman numerals I-IV you can unlock this week. If you check your quest tab there’s simple things you do to unlock them like heroic public events or altar of sorrow. They become your deck to start. When running the seasonal activity you randomly get a card that gives you a buff during parts of the new activities. The buffs are cool like extra special on kills or damage after every kill etc. As the season continues you unlock better cards. Secondary cards give you red borders or engrams to cash in etc. Your primary cards function as an extension of the artifact so you can slay out.

Oh wow thanks. I thought they were just active at all times haha. I was wondering about that. I actually like that. Thanks.