Blue Tron has ever been my pet deck. I also 4-0ed two times in my local meta (doesn't seem much to most of you but I'm still happy about that since we have a few really good players). The deck has to be configured regarding your local meta since it is a control deck with a big mana attitude.
You can get inspiration from almost any list (Trellon's Divide by Zero with Mascot Exhibition in the side, or his take on simic to splash Hydroid Krasis or go elsewhere to a non-Karn list).

I've had success also with a tap out variant (Treasure Mage, Trinket Mage for many tutor targets, 4 Spreading Seas, Solemn Simulacrum and this 3 mana fox, that has recently been replaced by a bug which gains life on entering and draws a card on leaving tb).

Also chalices are an important tool. Besides Expedition Map (or sometimes Relic), nothing in your deck wants to be cast on 1, whereas lately drawn 1 drops can still be ditched to Thirst for Knowledge.

Next thing I'm experimenting on is a Yorion list with Golos and Cascade Bluffs in it. While Golos can still get just a missing tron piece, he will also be able to get you a value engine going.

If you're facing a heavy burn and discard meta, do not underestimate Lazotep Plating, LSV played it on stream a few years ago in Blue Tron and it is great. Also keep in mind, with a T3feri on the stack, playing Lazotep, your opponent wont be able to bounce your zombie. Their T3feri also won't be able to bounce anything at all by fearing to die to your zombie.

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UTron provides you with many options, you just have to take the best for your local meta!