Besides their scarcity and age, they were just darned useful
The lore of Lorcana runs deep through the game, and is as much a story as it is a competitive TCG
If an effect requires you to pay some amount of mana to prevent Dyadrine from being countered, as Divert Disaster does, that mana wasn't spent to cast Dyadrine and will not be taken into account for Dyadrine's second ability
The value of X isnt defined by the text of the Fireball, so in any zone other than the stack X equals 0, on the stack X equals the value which was announced by a player during casting of the spell
We will see more cards that interact with them as time goes by
Illustrated by one of the series's creators, Bryan Konietzko, this card unites the dazzling Booster Fun treatments of Magic with Avatar: The Last Airbender 's style, making it a fitting capstone to your collection