From a rules standpoint, it's a little unclear yet how Wizards of the Coast could utilize proliferous Artifact subtypes
Rarity is another major factorfinding first edition cards, which were the earliest printed, are the trickiest to find and by far the most expensive
You can't return the creature you sacrifice because it will still be on the battlefield at the time targets are chosen
Similarly, Burst Lightning has entered Standard in MTG Foundations - and because of the peculiarities of this set, is now guaranteed to stick around for at least the next five years
Cards like Underworld Breach and Yawgmoth's Will take these even further by turning the graveyard into an extra hand
Then again, it requires that you play Shunoros in a Vanilla Deck, and they don't usually carry LP restoration