Four and five were often easy targets and hard to design top-end cards for, so seven felt natural, and the reference worked
This one follows the Fabled set, which received quite a bit of negative response due to a majority of cards in the set being reprints
Because of this, effects like Howling Mine, Kami of the Crescent Moon, and Walking Archive are incredible with King TChalla
Planeswalker commanders are more vulnerable to being removed in combat, so it's likely you'll cast Quintorius a few times in a game
There are no Energy cards
A few years ago, a Youtuber by the name of Megacaptialg made a video titled Waifu Tax, describing a similar trend happening in a different card game