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I'm not sure how much Archfiend would need this, but the DARK Dragon-Type effect could just let you draw without the discard and still be fine, unless you have planned to take advantage of the discard in some way, which DARK monsters often do, but I don't think the decks that could use this card will really go for that
Gruff Triplets' effect will consolidate all that power if any of the three creatures die, so no power is lost as the three Triplets are lost until the last one dies
The flip side of the card is Tibalt, Cosmic Impostor, a very strong planeswalker, but slightly overcosted
Their high valuation stems from being rare, representing the debut release of Pokmon cards in the U.S