Jirachi is a risky card admittedly, but the speed that it can bring to a deck is definitely something not to be overlooked
The base non-foil version has a TCGplayer market price of around $87
Playing with more than three colors is a rather advanced technique
If you're not interested in battling, are a fan of a particular starter Pokemon, or want to build a deck with a specific Kanto starter in mind, you should choose whichever pack contains the starter Pokemon you want
Moreover, its Shadowy Spellbind ability keeps Supporter cards at bay so the opponent cant use stuff like Lillie, Red, Mars, Cyrus, etc., throwing their strategies out of the window
When I first got my hands on a Dark Machamp card, specifically the 2000 POKEMON ROCKET #10 DARK MACHAMP - HOLO 1ST EDITION, I was immediately drawn to its powerful attacks