Organic Extinction is another in a line of cheap board wipes that help offset tempo loss, and itll find a home in decks like Osgir and Breya
The same is likely true of Giden Blackblade, too
In theory, you shouldnt be making any changes at all between games
Grim Servant Tutor on a creature, based on devotion to black
MacCready, Lamplight Mayor gives skulk to your small creatures, making them unblockable by bigger creatures and helping your attacks with tokens get through blockers, especially if you dont have any anthem or +1/+1 counter effects out on the field
The lone blemish that the mechanic has is the existence of Alrund's Epiphany, and while that card maybe shouldnt have foretell printed on it, its intrinsically powerful enough that the mechanic isnt entirely to blame