Frost Lich Jaina. The power level of control mage has increased since most of the aggro decks are gone (at least on EU. They are still there, but lessened).
I saw in your post the argument of deck thinning. Deck thinning is not something you should look at and you should try to ignore these kind of terms unless you run combo decks. Patches was never inserted in combo decks as they generally use card draws instead of Patches. So Patches never thinned the deck.
If you are thinning a deck, you are looking for specific cards. I doubt you did that. But even if you did, there are whole maths about the % of chance you get when you look for 1 or more specific cards in Magic the Gathering.
Attached to this post, you'll find an image that someone made on the MtG Reddit that shows the probability chances. So only from 10 cards left, you'll see a reason for thinning your deck realistically. But then you already long played Patches (hopefully).
Another help; this is an article that goes very deep. It's kinda boring if you are not interested or not that good in algebra, but it tells a lot.
Also, Reynad made a video a year ago about Patches and the term "thinning". While it's a bit provocative, he also explains more what Patches did. Start from 9:14.