Cut Red mana, might not be correct? Cut Alter due to no red and lack of heavy mana cards. Might be wrong, no free sac outlet for worm kind of bites but probably better for other cards for value. 3 drop slot might be bloated right now? I really would like a 2nd 4 drop.

Cards I'm thinking about:
Body Snatcher for easy Bearers?
Dictate of Erebos for Sac value?
Cauldron Dance for Bearer/Reef Worm Shenanigans?
2nd Reanimation Target would be nice as like a two of maybe, reef worm is passible but decently worse without altar.
Myr Battlesphere goes well with altar if I put it back in. Rift worm nearly pays for it on it's own, and up to 8 mana from tokens. But not very thematic.
Ryusei might be most thematic and probably possible to just hardcast. But it probably gives the enemies removal spells more value then they should have? Also makes enemy boardwipes a disaster I think.