Dockside Chef is a similar enough card to Vampiric Rites while adding more interaction by being a creature and sac'ing a whole other permanent type. The life gain in black needs to be carefully controlled. Plus I like Ramen.
Dakmor Salvage is only in here for Molten Vortex and is otherwise very hard to use. There is very little need for Dredge to be in the cube at all.
Adding in more enchantment based removal and losing a more inconsistent one in Regicide. I will miss the draft matters aspect of it, but it's for the best having it gone since it was the only one.
I severely underestimated how good the saga creatures in Kamigawa are and will be adding this one since this is an enchantment matters color. I need to remove another source of lifegain in black since I really don't want black to be able to have that many sources.
I already have quite a few sources of haste but I am trying to have a density of playable artifact creatures and Kird Ape is just a bit too boring. 2/3 is huge here but the old monke doesn't really do much else.
In that same spirit of removing pretty vanilla creatures I'm swapping the near identical 2/2 goblins with downside to other goblin cards that care about artifacts. I feel like there is finally enough scrap around for Kuldotha rebirth to be functional.
Probably a bit of a contentious swap, Helm of the Gods for Rakdos Cackler. Neither red nor black care about the counter and both have other tribes to care about. So really this is a vanilla 2/2 that can't block. Meanwhile Helm is an equipment, which red cares about and it counts enchantments, which black plays a few of.
Portable Hole is very exciting, and I can't believe I didn't have these other gems in the list.