pokemon rising rivals booster pack Platinum: Violet Destined Rivals Sleeved Booster Pack Cynthia Expansion Overview | Pokémon TCG:

Making X 2/2s for X mana is a sweet deal, but paying mana at the end of the turn when you likely need to spend it to enable the life loss needed to trigger this in the first place is pretty miserable

You can also pay two life and sacrifice another Creature to fetch a card from your library and put it into your hand

That suggests that at least for now, the plan is for trading to only be available for older sets, presumably the ones where hardcore players have already maxed out most of their library and are just chasing a final handful of cards that still havent come up in packs for them

This set was released in the spring of 2007 in Japan, and the summer of 2007 in North America