Tips on Twisted Fate's ultimate and roaming in general?

I love twisted fate, I like to play him no matter the matchup, and I think I got decently good with him, I can 95% of the time get the card that I want, and I can use wild cards efficiently, but I still have a lot of trouble with his ulti, it is probably more of a problem with roaming in general, I never know the right time to gate, how to roam, and I am often afraid the roam will end up in failure
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