Speaking of a monster that can activate effects and shut out attacks while adjusting the attributes of the opponent's monsters, I think that the dreadfulness of this card is fully conveyed
Kolvori, like Esika, cares about legendary creatures
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During your Main Phase, you can: Immediately after this effect resolves, Normal Summon 1 "The Weather" monster from your hand
That's a lot of money to spend on a card that will just make your playgroup hate you
Between all the counterspells flying around, instant speed effects, and unique kindred effects to enjoy, there's a ton of power in this color combination