Its great as part of a combo deck with Dualcaster Mage and Neoform in Constructed formats or paired with many, many cards in EDH and other eternal formats
Since enchantments are permanents, you need ways to remove them by either destroying or exiling them
Although seven mana, four of which in different colors, is a hefty casting cost, the ability to essentially refill your hand is huge, especially for midrange strategies
In case youre wondering, it exiles your opponents creatures when your creatures die, until a player has no creatures
It is also distinct from normal discard decks in that these decks focus on discarding your own cards rather than just taking away your opponents
With only a few dozen whitebacks reportedly produced at most for any card, artist proofs have themselves become highly collectible among MTG collectors - potentially being even rarer than the few surviving copies of the Alpha Black Lotus and other Power Nine cards recorded today