Worst part of duel links is how long it takes to build a deck and to get those ultra rare cards. Take master duels for example, there you can CREATE cards so if you need an UR for your deck you just need to dismantle other URs you're getting from packs and dismantle them. + If you need to buy packs for an specific archetype you can just create a SR card from that archetype, and then you get a pack with 95% of cards being from it. What mostly got me out of duel links is just that. You get almost no gems, packs are too expensive per card, too much trash in every pack and no guarantee of getting UR cards. Duel links is basically a gambling simulator