Just by being played, the card prevented a player's opponent from casting spells at Instant-speed, forcing them to only play during their turn and shutting down a huge number of playstyles
If Green can have the ultimate Coastal Piracy with Toski, Bearer of Secrets, then White can be allowed some actual good draw too, no
In contrast, an English chase card with low pull rates can become very expensive on the secondary market
Few Pokmon can shift a game's tide as efficiently, no matter how strong they are
Some rare-rarity cards only exist in reverse-holo and holo versions, others only exist in standard and reverse-holo
Both apply continuous advantages to the players who has them, both apply to one and only one player, and both have very narrow interaction with other cards, only ones that explicitly mention them