Playing a format where you have access to most the cards from over 27 years means you were more likely to enjoy new cards that referenced the past of the game
For Flesh and Blood, this will often be set either to 4, since hands are four cards at a time, but there are some situations where you might want fewer (opt X, for instance)
While this is just a silly Green creature, if you're able to attack with the Hydra more than once without it being killed, you're likely winning the game thanks to trample
There are differences in how the box opens, an asterisk or might not be present after the TM on the front, the back of the cards artwork has different cards, Pokemon is sometimes centered aligned on the back of the box and sometimes aligned left, the pull strip can be gold or clear, and the copyright dates could be 1999 or 1999-2000
Guardian Augmenter Guardian Augmenter should never be accused of being a big, dumb troll
(Bulbapedia Expedition Base Set)