Horu

They would just be a 400 point boost over a Metalmorphed Red-Eyes or Zoa. They would be more situational than Equips such as Axe of Despair while still offering less of a boost. Plus they dead draw really hard. They would need even more going for them in order to be useful cards.

If you put them in the ED with the same summoning conditions, which isn't really something Yugioh did until many years afterward, then a mere 400 point boost would be more ok as you never have to risk dead drawing them. But it would still just be a 400 point boost, an upgrade over Metalmorphed Red-Eyes/Zoa for sure but nothing that I think people would absolutely want to build their decks around.

(Also this is entirely based off of old-school Yugioh fwiw, there's like no way you could make Metalmorph viable after that without absolutely breaking cards)

My status replies are too skinny aaaaAAAhhhhh

The problem is Metalmorph only gives a 300 ATK/DEF boost + 50% of the ATK of the monster it attacks. REBMD and Metal Zoa only get a 400 ATK/DEF boost and they lose the entire point of Metalmorph.

I'd be fine with REBMD being a Lv8 2700/2300 with the 50% ATK boost under it's current summoning condition. But as is, it makes a good drop for those Lv8 Ritual monsters.