While its no Charizard, its value reflects its immense popularity
To get token generation from it, youll need a deck that has a fair amount of interaction, although creating 4/4 Dragons is worthy in its own right
It's likely to catch removal, but if it sticks you'll have a rapidly growing flier that makes your opponents sacrifice a nonland permanent with every attack
If you return a "Crystal Beast monster that is treated as a Continuous Spell Card to your hand while returning your opponents card to their hand, you can gain a big advantage
While the ability to recycle a discard pile into the deck doesn't advance the game state by itself, it does allow the reuse of cards that do
Plus, if you win after getting so many cards, the maximum hand size doesnt matter that much