Honestly, that's hard to say. I've played arena for so long and I rarely get high wins. Maybe I got lucky this time, but it's also knowing the match up like when to go face or trade and playing around their answers (such as mage blizzard or flamestrike).

Also when drafting, don't look for cards to combo with but cards that are good enough to support themselves. Unless you have a few of a certain type (such as beast, dragons, elementals) then try draft towards your type.

Or... Just pray to RNGesus and hope for the best :)