<puts on a bright red nose and hires a Mariachi player>
I mean, what else can you say about this? 5 mana do nothing, and occasionally you'll draw spells that might be useful secrets, might be powerful attacks, and might be a pyroblast aimed at your face.
I do like that this seems to be a reference to the legendary Deck of Many Things, a D&D magical artifact that... well, if you give it to a party of adventurers, they'll basically ruin whatever story you have planned :D.
But yeah, no, this is a meme card, and it's going to be utterly awful for Mages to pull from random spell generators...
That isn't really all that true. One of my favorite ways the three are described is the way it is done in the this article, which is the one that preceded the article the other person linked.
>Timmy cares more about the quality of his win than the quantity of his wins. For example, Timmy sits down and plays ten games. He only wins three games out of ten but the three he wins, he dominates his opponent. Timmy had fun. Timmy walks away happy.
>Like Timmy, Johnny cares more about the quality of his wins than the quantity. For example, let's say Johnny builds a new deck that has a neat but difficult way to win. He plays ten games and manages to get his deck to do its thing… once. Johnny walks away happy.
>Spike cares more about the quantity of wins than the quality. For example, Spike plays ten games and wins nine of them. If Spike feels he should have won the tenth, he walks away unhappy.