Aside from the far less potent Modern dredge deck, owning four copies of this ridiculously expensive card is just about the only way to play a competitive Dredge deck and in the Vintage format of all places
But what sets them apart most is the variety in card treatments: foil , extended art , borderless , showcase
But, it is a Wolf, which could be relevant when Innistrad arrives in a couple months, and the enchantment does so much else that you can afford a less exciting creature
In Pioneer, there's an Azorius spirits deck which can flash in creatures to trigger Enduring Innocence twice per turn cycle
Some companies or individuals offer pre-made MTG proxies for sale
This is an excellent way to protect your own things, but it does have a small drawback, and thats because it doesnt say Creatures you control. That means that even your opponents things will be protected if they happen to be playing the same tribe or just some cards that share a type