Paying four mana to draw one card seems like a terrible rate, and by all means, it is, but there are two crucial things to consider before you dismiss this card: the mana cost is entirely generic, and it can snowball fast
Basically, no matter what your opponents choose to do, Rhystic Study will be super annoying for them to play around, and whats annoying for your opponents is great for you
Even if you fail to flip, a wizard is not the worst creature type to have floating around
You craft your deck pre-match , drawing from a massive card pool ( around 20,000 at this point)
The frog and the swan represent the best payoff and enabler for the blink theme in Bloomburrow
You also wont be forced to play one or two drops that dont fit your strategy just for the sake of cheapening your late game cards