They signify a higher rarity, often boasting unique artwork or holographic features that make them stand out from the crowd
But lets not ignore the money side of things
Removal spells Dismember is mostly for creature-based combo decks like Twin and Pod, but its also useful in the mirror, in matchups like Merfolk, and against any random decks that have creatures that will otherwise dominate the board (Im thinking decks that have a couple Baneslayer Angel or something)
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Getting a boost from your untapped non-attackers drives your attacks through further and gives you the chance to completely eliminate those permanents you might not have been able to do any damage to otherwise
You can grab the Gardevoir ex League Battle Deck to get started, but be warned: some cards in that box have rotated out, so you might want to customize your build a bit