It means they cant be countered - and if you also find a way to flicker your enchantments to ensure they can enter the battlefield without being cast at all, you suddenly have a way to put nearly everything in your deck into play with ease
And thats when Pokmon taught an entire generation an important lesson about capitalism more specifically the lesson of supply and demand
Before it was banned, this card could flat-out remove a win condition (by not letting a player run out of cards), drastically extend battle times, let repeated Trainer cards be played, and allow for frequent deck skims
Yes, I've been working on Mood Swings since 1998
Their infamy makes them the ultimate status symbolowning one proves you hold a piece of the game's broken history
The last Un-set type to make the jump is a bit lesser-known, but no less important