I really like the concept of the card. It's a little like fallen druid, yeah, but with a different spin on it that makes it ideal for synergies with death -- since it actually kills a creature to replace it with a random one. In
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decks, you'd definitely use this instead of making mutants, because this would power all of your death effect cards, making it kind of like a cross between Schrodinger's cats and druids. It's a little unreliable to base a deck around it, but I like the idea of rolling the dice until I get a random creature I want (powering my boneyard and bone wall the whole time), then moving on to the next creature (probably one of those skeletons the boneyard made).
What if the upgraded version was the same as the non-up version, but summoned a random elite/upgraded creature? That's the preexisting trend for fate egg and pharoah -- same card stats but upgraded outcome.