Our build is all-in on creatures and Birthing PodBirthing Pod, leaving little to no room for anything else
Since it counts all the permanent cards in your graveyard, Souls can get out of hand fast with just a self-mill effect or two
While the format did have Thoughtseize, beyond that, it lacked cards like Force of Will or Wasteland, which have historically helped keep degenerate combo decks in check without having to play very narrow answers that only hit one or two decks
You want things that fill your graveyard with enchantments, like Bitter Reunion and Ripples of Undeath
That said, so long as you dont mind it being a symmetrical effect, Mass Hysteria is just better
double strike A creature with double strike deals damage twice each combat: once before creatures without first strike or double strike, and then again when creatures normally deal damage