So, you found this Guide and asked urself: But why?
Cus it is stupidly effective.
Hey, im Flow, I got about 100k MRP on TF over the years and enjoyed AD TF Midlane for a looong time.
With the new changes to his W and to Trinity force (and the fact I am an ADC now) made me want to dust of my old deck and hit the botlane with it.
And it worked like a charm. I even played a few ranked games with a Braum pre and we rocked it, we almost could win the game by ourselfes. (Im Gold 3 atm, experience can be different on ur elo)
So how does it work?
It works because of his e!
His e is almost a whole item in Stats (in my humble oppinion) and makes it all work.
The extra on-hit and attackspeed gives TF the power to 1 v 1 almost every Champion and makes it way to easy to set up picks with w and just autos before or in big fights.
And with the cdr from Trinity you can dish out just a tad more Yellow cards to cripple the enemy Team. (ITS A 2 SECOND STUN ON LVL 5 WHAT DA HELL).
I am not very creative so idk what else to write, so just try it out aannnd ask my anything in the comments! :)

LVL 1-5: Chill, just farm (dont forget redcard to poke ur enemys on lane while clearing minions)

LVL 6: Ult mid if possible to get a free pick. Takes a little practice to spam Ping ur Midlane to engage ;)

7-18: Keep the farm up until full build and pick enemys with ur W into AA combo (its the only "combo"). Use ur ultimate for pressure and picking purposes, you can join fights, take a turret or just use the vision/tp to get out of a sticky situation (w enemy into tp away is very funny) You can take Teamfights, but your priority in them is surviving and ccing anyone in ur range and or the enemy carry. You are the eneabler, not the uber dmg carry, not in team fights at least.