The Court cycle is extremely powerful. Mock Court taxes Ordinary minions, Court of Equity taxes Elite and Unique spells, and Mobbed Court punishes Elite and Unique spells with damage.
While they are all extremely powerful, the former is, I'd argue, more impactful than the latter two in a specific way: it strategically obsoletes the viability of what it taxes. This article will explain why.
Cost of a Tax
Causing spells to cost more will always be detrimental to the player being taxed. The impact of those taxes, however, is not uniform across rarities due to Sorcery's inherent design approach. Elites and Uniques are powerful not only for their effects but also for their comparatively low cost-to-impact ratio.
For example, Plague of Frogs is extremely powerful for and is gated by its 
threshold, but paying for a Plague of Frogs in the face of a Court of Equity is still a powerful spell. Compared to its Exceptional counterpart, Four Fat Frogs, Plague of Frogs still offers a better rate for summoning more frogs that can be summoned to any site, rather than just an allied one. In this example, Court of Equity is not quite living up to its name.
On the other hand, Ordinary minions are not undercosted for their effects. At best, they are costed fairly for their effects. At worst, they are too expensive for competitive play.
Mock Court differs from its higher-rarity-taxing counterparts because Ordinary minions don't have the same leeway to afford a -mana tax in the way an Elite or Unique spell likely does. Add to any Ordinary minion, and it likely is no longer viable.
Sorcery's First Guardrail
A guardrail is any card that dictates the terms of engagement simply because of the risk of playing against it. Its existence influences deckbuilding decisions, and the metagame is, as a result, constrained by what the guardrail dictates.
If your opponent plays a Court of Equity, your Morgana le Fay is still a very playable spell. Although it will be delayed by a turn or two, paying for a 3-power minion that draws three cards is still cheaper and stronger than a Grandmaster Wizard.
Paying for a Wild Fanatic isn't getting the nod in any decklist, regardless of how desirable an early aggressive threat might be. Villages requiring to summon a Foot Soldier price those Soldiers out of the Realm.
Guardrail Specificity
Some Avatars must adhere to guardrails specific to them. For example, Archimago and Deathspeaker must be prepared to combat Mismanaged Mortuary and similar disruption, either by playing answers to them or by adjusting their card choices out of respect for them. The same is true for Sorcerer against Garden of Eden.
Not every Avatar must respect cemetery-disruption sites, though, since many Avatars do not care about cemeteries at all. Likewise, some Avatars could ignore Garden of Eden since they don't intend on drawing more than one spell per turn.
Mock Court is the first universal guardrail in that every deck could care about Ordinary minions, whether they be tokens or actual cardboard. Since Mock Court taxes summoning, not casting, it affects everything from Foot Soldiers to Frogs to Skeletons to actual minions in the Spellbook.
Courts are Free
If the Courts were instead monuments that cost mana or auras that cost mana and impacted only part of the Realm, they would arguably not be guardrails. Mock Court being free as a site and affecting the entire Realm in perpetuity is why it strategically obsoletes Ordinary minions entirely from competitive viability.
Court of Equity taxes spells closer to what they should arguably cost for the rate of their effects. Mock Court exacerbates a rate that is already at its limit. No Ordinary minion that costs more will have such an impact as to swing the game back in your favor. Archangel Michael costing against a Court of Equity still could.
Since Mock Court is free, it's not just taxing on rate minions but effectively stealing that mana and/or blanking those cards. For example, if your opponent plays a turn one Mock Court on the play, every Ordinary minion in your Spellbook becomes a huge liability.
The impact on your curve might, at best, blank a turn cycle; at worst, compound behavior. You might have to spend a draw step to pay the tax so the in-hand Ordinary minion isn't blank, and then spend time deploying that Ordinary minion, whose impact will be so severely diminished as to be potentially worthless or even actively detrimental.
From a strategic standpoint, the sheer potential of that possibility is sufficient to remove any consideration of including Ordinary minions in your Spellbook entirely.
Overflowingly Insufficient
Overflowing Court is an attempt to counter the power of the other Courts by disabling their effects for a turn. Its failure to accomplish that task is multifaceted, but the primary reasons are that it must be developed after an opposing Court is already in the Realm and only lasts a single turn.
Playing Overflowing Court as a counter to Mock Court assumes the luxury of not having to play it ahead of time for development. Timing issue aside, it only offers a one-turn window, meaning Ordinary minions can be summoned on rate, which, as mentioned before, is already at the top end of what is reasonable to pay for them at a baseline.
Don't underestimate how much behavioral influence the Courts have: for they warp behavior and decisions around them.
Other options like Acid Rain, Atlantean Fate, Castle's Ablaze, etc., to destroy or turn off a Court are lackluster to insufficient because they cost mana. If mana and time must be spent to combat a Court, it presumes that the Court has a meaningful impact on the Realm and that impact is felt as soon as it is played, thereby paying dividends on the mana its controller spent to deploy it.
Heirloom Lost has similar timing issues to Overflowing Court and develops your opponent ahead of you. Sinkhole and Fields of Phyxis have spacing restrictions that make them unreliable answers to specific hate sites.
Exceptionally Broken
If Erik's Curiosa's intent with the Court cycle was to heavily incentivize playing primarily with Exceptional minions, since that is the only rarity unaffected by the Court cycle, I believe they succeeded. However, I think Mock Court went too far.
Mock Court might not be considered a mistake, but I believe it will haunt Sorcery going forward until it is somehow errata'd or outright banned.
Every new set will require players to look at Ordinary minions they might consider playing and ask, "Would I still play this if it cost more?" The answer will more often than not be no, thereby rendering those cards obsolete in the pool of competitively viable cards to consider for your deck.
How can anyone combat this? Are the designers supposed to cost Ordinary minions less than they otherwise would have, effectively powercreeping designs out of consideration for Mock Court?
Dangerous Game
Universal guardrail cards are a constraint on players and designers and ultimately a net negative for the game overall. Designers have to adjust their future designs with them in mind, and players have to adjust their deckbuilding to minimize their overwhelming impact. Guardrails create an undesirable tension at every stage of the process, from design to deckbuilding to gameplay.
Hopefully I'm wrong, but I won't be playing with any Ordinary minions again anytime soon, and I recommend you do the same.
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Featured image: Mock Court by Franck Pawlowski
