When it comes to creatures, spells, and land, Wizards has years of experience and data to figure out what the right baseline power level is, and as we just talked about, they tend to aim far enough to the "safe" side that even if they miss, the result is a very good card (like Collected Company), rather than a ban-worthy monster
The typal themes of the Innistrad block were more opt-in rather than the prescriptive experience of Lorwyn Draft
The answer is you don't, and you just embrace what Izzet always does
Also, cards from Homelands are allowed (nothing from Homelands is banned except the ante card Timmerian Fiends).
Since this is mean and has no brakes, this is nasty