Decanter of Endless Water Three-cost mana rocks that do something interesting is a design strategy thats been running for a while now
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While X spells don't always thrive there, given the prevalence of "cast without paying its mana cost" effects that like to cast them for zero, many consider ElectrodominanceElectrodominance worth the risk because it allows you to burn an opponent out with all the mana you've acquired from your rituals, then tack another spell on to continue the process for others
The catch being 4 Energy requirement and 50 recoil damage hardly matters
Since there are effects that reference counters this time, if you have those, you can even cast it early to set up a combo
So, the Set Booster has less overall commons and uncommons than a Draft Booster, but we believe we've balanced them to what is more optimal to the players (not creating cards they want to ignore so quickly) to allow us to put other things in the booster that would be more exciting and impactful