Make sure to pay attention to these differences when you buy non-Standard sets so that you have a full understanding of what to buy
Whats under this skin
I have some experience with PS1 save hacking, but GBA is a whole different game since it seems every time I save the game, and then open it with a Hex editor the adresses change
Besides the rather weak gameplay effect (if the player had creatures in the first place, then they would block the Necrite with it), I'm not sure what the 'sacrificial' bit is supposed to represent here
Take for example, the Future Supporter, Professor Turo's Scenario, which returns your Active Pokemon to your hand at the cost of discarding all cards attached
There are exceptions, of course what was Wizards of the Coast (WotC) thinking with Oko, Thief of Crowns