This is either 2 mana for an exiling Disenchant or 4 mana for Utter End, which a fairly middling piece of creature removal that sometimes snipes different permanent types for half the cost
Some of these prices I had to go back and double-check, especially Edgar
System Information: Recently updated Cockatrice via Oracle to get newest card database
If they dont have an intervening if (meaning the part the card that says if you have the citys blessing is its own sentence), then the trigger will happen regardless of if you have the Citys Blessing or not, but will not do the part of the trigger that references the Citys Blessing (for example, Kumenas Awakening)
Were perfectly safe here
In general, when looking at power level, I considered the overall game plan, the synergy of the 99 with that game plan, things like interaction, ramp, mana base and card draw, the commander, and the power of the remaining stand-alone cards