Blue control decks are full of counterspells, card drawing and removal
Then we have Deep-Cavern Bat, a card that I man, this was not meant to be a testament to design decisions, I didnt mean to make this a magic design article, I was just going to tell some jokes about bats and be spooooky about it but hey, this card represents an amazing wording change, because it introduced a new use of the word until in magic language
If you chose not to exile a card, the effect of the last ability won't do anything
But the tale doesn't end there
If a card has an effect that specifically removes counters such as Vampire Hexmage, Glissa Sunslayer, or even the newest card, Render Inert, that could also fulfill the transform requirement
If you want something a little less explosive, however, Stinging Study can work wonders in the right deck