The cross-promotional campaign with McDonalds saw panic buying of Happy Meals, with some collectors buying 30 at a time, even though the cards included in the boxes arent particularly rare and are unlikely to make your fortune in years to come
UW Control is truly the 49% win-rate deck, where pilot skill is what turns that number into 51%
Based on the latest market prices tracked on TCG Stacked, Groudon is worth about $0.71 USD
While it is a decent card for its cost, there are better options such as Giant Spider or Steelbane Hydra that offer more versatility and power in the same mana cost range
It could be a component of another heavy-white aggro deck that preys on greedy decks (as was the case in Kaldheim and Strixhaven), but the risk here is so high and the reward so narrow
Give it rebound and store another copy for later