When many decks are drawing completely dead against a three-drop, that's a strong incentive to find a way to play it or at least sideboard it, even if your deck suffers quite a bit while the card is in play
Hobgoblin Bandit Lord not only gives your Goblins +1/+1 , it can straight up kill one of your opponents
Shiny Rare Pikachu started February at $34, but its more than doubled since then, with most of that growth coming in April
This is normally a bad thing, but the rules of the game state that if a player is required to draw a card but has no cards left in their Deck, they immediately lose
These packs flew off the shelves and became more valuable than gold, especially if you were the lucky kid who pulled a Charizard
Doubling Season also has synergy with Biogenic Ooze, Rowan Kenrith, and Will Kenrith