If a creature you control would enter the battlefield with a number of +1/+1 counters on it on a turn where Prairie Dog's last ability has resolved once, it enters with that many plus one instead
It sits around looking dopey until it gets the first attack in, and the amassed army is a nice bonus, but nothing to get worked up over either
Third Edition also comes with a modular board which enables considerable variation (something that was never a feature before.) Theres also a bit more structure this time, with four scenarios (complete with specific event and codex decks) to work through, rather than just an overarching story with random elements
So if anything, I would expect the 30th Anniversary to bring some of them back in, leading to a small uptick in popular Pokemon from Diamond & Pearl, Black & White, and X & Y
Each era and sensibility gets some special attention
The reality is, many Book cards share this ability