Standard is also a format full of similar high-impact, bad-to-kill-after-resolving cards that are outside the range of Inquisition of Kozilek but are selectable with a cleaved Dread Fugue
Skull Dragon
And second, while there is, of course, a metagame and you can find decks with different power levels, the reality is that Expanded is very, very difficult to predict
Incapsula incident ID: 1446000410134174434-613654692440181326
According to WotC's Frank Karsten's metagame breakdown, more than half of the Standard decks from the Magic's World Championship (which launches today, by the way!) play Boomerang Basics, usually as a full playset
In short, you can completely counter a group of spells in one cast, make combat way more confusing or straight-up win a game with just this card