Black and blue typically get the scraps left over from the other 3 colors, resulting in a lot of varied card designs that are often mechanically unique
But the decks that would've normally risen to take their place: Azorius Omniscience, various forms of Self-Bounce, and Domain Overlords, have all lost important cards, which will hamper or outright end these archetypes
For now, its in a great spot
For each creature I sacrifice, Mycoloth will get two +1/+1 counters and on my upkeep I'll make a 1/1 Green Saproling for each counter on it
Or give it some lifelink to get 3 life for every land
Has Improvise, which allows you to tap artifacts that you control to help pay for Foundry Assembler's casting cost, each artifact paying for one generic mana