(Note that the card was not originally a Shapeshifter in creature type because, at the time, legendary creatures were creature type Legend.) The challenge to the design was to create a mono-black creature that felt like a Shapeshifter
Its definitely too low-impact for much Commander viability, but its a sideboard staple when its in Standard since its difficult for blue decks to handle
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You can only use each of the following effects of "Infernoble Knight Oliver" once per turn
You'll lose the ability to quest immediately with him, but the trade-off is being able to play an eight-Willpower Bodyguard (that heals itself) on turn four instead of turn five
With such a huge reduction in cost, if you cast an enchantment for its miracle cost, you can bet that there are all sorts of high-cost enchantments in the deck