Kaladesh, like most artifact sets before it, was pushed to the limit as far as power level was concerned, which led to multiple bannings in Standard (and was around the start of bannings being so in vogue in Standard)
Vampires are already one of Magic: The Gathering's most fearsome creature types, but what if you could turn your relatively fragile Vampires into bloodthirsty Demons
You also have Skullcap Snail and Unscrupulous Agent to exile cards
Madness (If you discard this card, discard it into exile
The big news right now is Overlord of the Balemurk, which quickly spiked from $12 to over $30 after Joel Doolittle made Top 8 at the SCG Con Portland Regional Championship with a (mostly) fair-looking Orzhov Ephemerate deck
All in all, I expect [casthaven]Malfunction[/casthaven] to be a comparably bad-but-powerful removal spell much like Sleep Paralysis was