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The lifecost is interesting, since black has historically been better at card draw than green, but this seems to argue in a different direction, although green has always been good at drawing through creatures, specifically

It has no notable vulnerabilities beyond its cost, and thats doubly true now that Divide by Zero is gone

A card is face down in the exile zone only if the effect or action that put it there specifically says it puts it there face down (like the foretell ability)

Then, if that Vampire/Demon dies, you get to draw a card and create a tapped 4/3 Vampire Demon token to replace it

A 6-mana creature that must survive a turn cycle to have an impact doesnt line up with the current format, especially since this elder dinosaur can whiff