When Legends debuted, legendary permanents worked a little bit differently than they do today
Each purchase includes a bonus card pack
Snorlax acts as a tank, allowing you to safely evolve Meowscarada, while using Barry to get in some damage with Snorlax if you have extra energy
It could be tokens, your own versions of cards already posted here, or new cards
Consider the difference between Etali, Primal Storm and Etali, Primal Conqueror, two creatures with very similar abilities, except Primal Storm triggers on attack rather than ETB
You get some value if this is the first card down that spreads counters for payoffs like Armorcraft Judge and Pir, Imaginative Rascal