The good news for the aftermath cards is that flashback is an extremely powerful mechanic, since it not only generates card advantage but also allows for some tricks to generate value only from the graveyard (a good example of this is Gnaw to the Bone in Dredge, which doesn't really plan on drawing and casting the card from its hand but instead just attempts to mill it into the graveyard and cast it with flashback)
She sees the faces of those who wronged her in everyone she encounters
Rounding things out, though it isnt an attack trigger, this is definitely an Akromas Will deck
A strong Fighting-type deck with cards like Marowak ex can potentially counter Pikachu ex, although that deck relies heavily on successful coin flips
From here, the new Broodlord can grab Yawgmoths Will, which you can use to replay all of the previous pieces from your graveyard to get more Broodlord triggers and mana
Sacrificing Fleshwrither is part of the cost of activating the ability