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 answer is you don't, and you just embrace what Izzet always does
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But there are still a lot of wizards that simply have a variety of abilities
Also, cards from Homelands are allowed (nothing from Homelands is banned except the ante card Timmerian Fiends).
Whenever another creature enters the battlefield, Rampaging Ferocidon deals 1 damage to that creature's controller