Well, it's because you can easily slot a few Mutavaults into your list - an MTG land that can become all creature types - to supercharge the card
Because you cast whatever creatures Azula swipes, you don't need to worry about giving it back if your opponent removes Azula like you would with Mind Control variants, and the enters ability means your opponents are always two-for-one'd at best
Let's discuss the Listed Median price more
Starmie, Gyarados, Blastoise, Articuno, and Palkia have all had genuinely viable EX versions, while Greninja is useful across several decks, and Vaporeon, Manaphy, and of course Misty have each been added to provide very strong, Water-specific support in different forms
Some of these Vs end up looking a bit too 3D in their art style, but it's worth noting that the Full Art versions of these cards, which started a bit weaker here, end up being some of the most beautiful cards of all time in later Sword & Shield expansions
For example, Bite of the Black Rose forces your opponents to discard two cards in the event of a tie
