Like most Magic: The Gathering cards, the value of Grond, the Gatebreaker depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (The Lord of the Rings: Tales of Middle-earth)
Superior printing standards: Japanese MTG cards are admired for their top-notch card stock, striking colors, and clear printing, making them stand out as both practical for play and valuable for collectors
This card captures that experience in physical form
Effects that exile cards from the graveyard, like Tormod's Crypt or Relic of Progenitus, directly remove them from the graveyard, triggering abilities that care about cards leaving
Though that is of course a significant amount of money for a single card, its a very far cry from the 10k+ of its most expensive version
I think this has to do with stacking the holos before the ink is dry or something as the pattern on the text of the card is the same as the holo