Death Cloud is a lot better than loads of the cards on this list but that is because it has a lot of functionality and not because it is a great mass removal card
In short order, they introduced: Affinity for artifacts, a cost-reducing mechanic Equipment, the first ever artifact noncreature subtype Artifact lands In modern times, Mark Rosewater discussed at length the problems of simultaneously developing the Mutate and Companion mechanic for Ikoria , saying that making too many new, complex mechanics at once leads to problems when developing them
Firstly, you can currently only trade cards of a one Diamond, two Diamond, three Diamond, four Diamond, one Star, two Star, one Shiny and two Shiny rarity
While it's nice by itself, seeing it with the Azelf and Uxie cards from this set elevates the trio of cards beyond their individual value
You need 5 devotion to black for Erebos to be a creature, but then he's a 5/7
Invasion of Arcavios / Invocation of the Founders Five mana for a version of Mystical Tutor doesnt quite work out