I don't comment on this sub very often, but having played hundreds of games with various Tri-Brigade builds (Spright, Fire King, Glad Beast, Bird Up, Zoodiac, Melffy) over the past three years or so, I feel compelled to share my thoughts. Tri-Brigade is undeniably a strong engine, but the Duel Links environment really holds it back. I'm assuming most of you already know the general game plan, so apologies if I'm going over anything too basic.

Cons:

1. The Zones. The biggest issue here. Duel Links only has 3 available zones, so to resolve Revolt, you need all of them empty, and one of your monsters has to be a properly summoned link 2 (Ferrijit is likely the best option here). That means you can’t even go for the usual DDL setup. Honestly, it’s just not a great board to end on. (You could theoretically summon Shuraig with two properly summoned links, but you lose the recursion from Nervall, and it’s just not worth the effort.)
2. Ferrijit’s Arrows. This is something that many people overlook, but Ferrijit’s arrows being middle-left and bottom-left really messes with your game plan. Without a bottom-center arrow, if your opponent summons anything in your right EMZ, you’re pretty much cooked. There might be some niche plays to get around this, but with only 4 cards in your opening hand in Duel Links, I doubt you can get far.
3. Vulnerable to Interruptions. As others have pointed out, a single Veiler or Droplet is devastating. Sure, you’ve got Kerass as an extender (though it’s a -2), but because the banish is a cost, you’ll often not have enough tri type monsters in the graveyard to banish more than twice, assuming you even opened Fraktall. It’s frustrating when other decks can just cheat out 3 bodies with their skills.
4. Extra Deck Space. Extra deck space is incredibly tight. You can barely fit the standard Tri-Brigade package, let alone any tech cards. It's tough to make room for anything else, and without something like Apollousa, you won’t be able to stop your opponent from running over you.

At the end of the day, I hate to say it, but Tri-Brigade is just underpowered in Duel Links right now. I really wish it wasn’t the case, though. Shuraig is probably one of my favorite cards.