When your opponent Normal or Special Summons exactly 1 monster (and no other monsters are Summoned) while this monster is on the field: You can make that monster lose ATK equal to its Level x 200 (until the end of this turn), and if you do, inflict damage to your opponent equal to the ATK lost by this effect
That means its subject to any changes in casting cost that it would be subject to with its normal cost, like with Animar, Soul of Elements
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If this werent reprinted soon, I could definitely see the price rising
Although tbf, I can understand why the Regis are low, since unlike the Eeveelutions, Rayquaza, Pikachu, Charizard, etc
Preventing your spells from being countered allows many of your most powerful plays to go ahead unimpeded