Before I dive too deeply into the set as a whole, though, I want to cover two aspects in a more broad sense all at once: toxic and corrupted
Zul Ashur turns your graveyard into a second hand, making it an engine piece for grindy zombie decks
If those Auras would leave the battlefield, exile them instead of putting them anywhere else
In the interest of moderating the strength of non-interactive combos in Historic, Painter's Servant is pre-banned
If an instance of myriad creates more than one token for any given player (due to an effect such as the one Doubling Season creates), you may choose separately for each token whether it's attacking the player or a planeswalker they control
And in the 14 years that followed, precons have become a marquee part of any new set