That being said, Ragavan is still an insanely powerful one-drop that threatens both mana acceleration and card advantage, and there's not much more you can ask for at one mana
Crucible of Worlds plus an additional land drop plus a way to mill yourself puts so many necessary effects into a single card that its hard to beat
In any sort of control deck I would much prefer a two mana instant card quality spell than a one mana sorcery speed one
CM, we believe, stands for Cartamundi (the printing company used to make Lorcana cards)
At the time of the announcement (see here), there were mixed feelings among the community, in particular in relation to the impact the decision would have had on the meta and the competitive events
If an exerted permanent is already untapped during your next untap step (most likely because an effect untapped it), exert's effect preventing it from untapping expires without having done anything