It digs you three cards, leaves a token of a great Creature, and replaces itself for four mana
A closer look at the card might tip you off to its special status, but many cards from this era share similar designs and are far from valuable or distinct, so this one is a bit of a surprise unless you're familiar with it

Sort Card Type Skeledirge #38Rare $0.85 Skeledirge #38Rare $0.20 Skeledirge #31Rare $0.14 Skeledirge #19Rare $0.22 Skeledirge - 031/191 (Cosmos Holo) #31Promo $5.87 Skeledirge - Armarouge 36 #38Rare $0.16 Skeledirge ex #137Double Rare $0.77 Skeledirge ex - 020/073 #20Double Rare $0.29 Skeledirge ex - 032/190 #32Double Rare $0.25 Skeledirge ex - 034 #34Promo $0.85 Skeledirge ex - 037/193 #37Double Rare $1.14 Skeledirge ex - 037/193 #37Double Rare $0.78 Skeledirge ex - 081 #81Promo $1.81 Skeledirge ex - 081 #81Promo $2.68 Skeledirge ex - 087/073 #87Super Rare $1.48 Skeledirge ex - 097/073 #97Special Art Rare $49.03 Skeledirge ex - 102/073 #102Ultra Rare $7.23 Skeledirge ex - 137 #137Double Rare $0.97 Skeledirge ex - 233/193 #233Ultra Rare $2.57 Skeledirge ex - 258/193 #258Special Illustration Rare $37.90 Skeledirge ex - 272/193 #272Hyper Rare $6.15 Skeledirge ex - 324/190 #324Shiny Secret Rare $1.02 Skeledirge ex - 097/073 #97Special Art Rare $49.03 Skeledirge ex - 258/193 #258Special Illustration Rare $37.90 Skeledirge ex - 102/073 #102Ultra Rare $7.23 Skeledirge ex - 272/193 #272Hyper Rare $6.15 Skeledirge - 031/191 (Cosmos Holo) #31Promo $5.87 Skeledirge ex - 081 #81Promo $2.68 Skeledirge ex - 233/193 #233Ultra Rare $2.57 Skeledirge ex - 081 #81Promo $1.81 Skeledirge ex - 087/073 #87Super Rare $1.48

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The price per card isn't quite as good as that of Battle Pack 3: Monster League or Shadow Specters: 1st Edition, but you're unlikely to see as many duplicates, and if there are only a few cards you're hoping to find, there's a chance you'll pull them in your first couple of packs anyway