I'm glad that you gave my build a try, you woudn't regret it.
I need to tell that this is my first build and i cant wait to see the results!
Feel free to take a look around and tell me if you have any comment ;)

Pro's

Amazing split pusher
Amazing burst damage
Nice global ult
Good ganker

Con's
Q = skilshot
tf is verry squishy

try to use your ''W'' (Pick a card) to last hit minions with your blue card
at later levels you can use your ''Q'' do damage minions and your ''W'' (with red card) to kill the minions fast.
Also use your ''Q'' when the minions are still walking so there all in formation (lined up for your ''Q''.

Always focus the main damage targets, like the adc or ap mid (if he is squishy)
you can use your ult to either enter the tf or to kill of the last guys who are running away with low health.

Also your ''Q'' is a verry good ability to herras, constantly use it!

Becaus of the global teleport ult of tf you are an amazing split pusher, just go to the other lanes and push it and if there is an teamfight going on than just jump in with your ult

GL AND HAVE FUN WITH YOUR NEXT MATCH WITH TWISTED FATE!