Once you get one token out of the deal, you almost always get more since the army of clerics grows each combat
because not only does it kill your lands, you can't play any additional lands beceause they'll become 0/0 creatures too
Inquisition of Kozilek is an incredibly powerful card: First, it has no downside, its simply a discard spell
Flavor is the concept of evoking a specific feeling, providing a unique and distinguishable quality to the game and is accomplished either from unique synergy from some cards or even from non-functional parts of cards, such as the illustration or flavor text
Hence, it was easier to ban 1 (Inverter of Truth) card instead of 2 (Thoracle and Jace, Wielder of Mysteries)
Genesis Chamber will create a 1/1 creature token for each nontoken creature that enters the battlefield