Valakut, the Molten Pinnacle Mono-red decks can get Valakut, the Molten Pinnacle up and running without much trouble, though multicolor decks are going to need Prismatic Omen or some similar effect to make this happen regularly
Whites section of the color pie has seemed to shrink a bit over the years, and is cluttered with mechanics like lifegain which struggle to hold value at a competitive level
The remaining cards from that same batch, left without the stamp, are what collectors now call Shadowless
You still own and control the creature you cast if you sacrifice a creature you dont own to the emerge cost
That might sound like a lot of protection, but think of it like this: If your deck is completely shut off when the commander or a similarly critical piece isnt in play, your opponents can beat you with a Swords to Plowshares or two