Its a great way to completely refill your hand in a single turn, which helps aggressive builds continuously apply pressure through the game and prevents you from stalling out or going hellbent at basically any point
Legendary Encounters: The Black & White era heavily featured Legendary and Mythical Pokemon, making these powerful creatures central to many strategies
No triggered abilities for you
You can partially achieve this through your Equipment suite
First edition prints from early sets typically carry more value than unlimited versions.
There are also some number of quality utility lands that involve sacrificing that make this card even better: favorite Mirrorpool springs to mind, but theres also Buried Ruin, Command Beacon, Inventors Fair, Urzas Saga, and if youre a degenerate Strip Mine