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Being able to play Riteknife in some sort of Grixis nastiness deck or a Mardu aggro deck with the knife in the hands of anything from a Mirran Crusader to a Grateful Apparition means you only have to sac one creature to get the Riteknife party started because Proliferate will take care of the rest

With 90 HP and a Move that does only 40 damage, it doesnt seem like the strongest Pokemon you could Evolve into

Also, this makes Standard Scam with prototype creatures possible

It's woefully generic, but you work with what you've got

Because of that, the fact that you have to draw [Super Rejuvenation] naturally remained a drawback until the end