For a Pokmon like Charjabug, who isn't known for its power, this was a wise choice
Outside the game, collectors still hunt down those same classics in real life and protect them with premium yugioh card sleeves to keep their decks tournament-ready and their rares in top condition
You can see an overview here: 90% (4th card), 60% (5th card) 5% (4th card), 20% (5th card) 1.666% (4th card), 6.664% (5th card) 2.572% (4th card), 10.288% (5th card) 0.5% (4th card), 2% (5th card) 0.222% (4th card), 0.888% (5th card) 0.04% (4th card), 0.16% (5th card) So, if you open 1,000 boosters, there should be one to two cards of the crown rarity
Monsters with 0 ATK are exempt from this rule: they both stay on the field after damage
Badgermole Cub It's unclear what WotC was thinking printing a 2-cost mana doubler, especially one that creates its own mana dork
Its nice that the entire Unova Dex is included, but if you have a particular favorite, it's not as though you're ever going to see it