No amount of sacrificing a six mana creature will pay the blue pips for you
Now, Emeritus of Abundance doesn't have the same flicker synergies as Eternal Witness, but it is naturally repeatable thanks to the attacks trigger
I'm also okay with Kaya, in that ult-emblems are generally allowable to be game breaking since they should end the game relatively soon
If youre self milling in any way, this is trivial to flip
However, it is still a fantastic addition to any deck with reanimation, or in any decks with white and green, home of the +1/+1 decks that also have powerful ramp
There are far far better ways to kill artifacts available in red than Rakdos Charm however they mostly just kill artifacts and are therefore too risky to be played