pokemon mimikyu card Credit Card Skin Placeholder Image Provided Mimikyu ex 069/159 Journey Together

This helps to keep the lower bracket decks from becoming too powerful

Swapping the creatures in each players graveyard with the ones they have in play can completely flip the game in an instant, assuming your army of the dead is the most powerful one at the table

Maybe it's a mechanics problem

A flurry of desirable expansions were released around that time, and coupled with the nostalgia of the Celebrations set, popularity exploded

At first glance that sounds like, "Why would you want to have less health?" But it allows you to use Level Ball (AOR 76/98), which searches your deck for 90 HP or less, so you can search out the Combee and you can search out Vespiquen