10 pack of pokemon cards TCG: XY Evolutions, A Booster Containing Per Pack with Over 100 New Cards to Collect : Toys & Games and near mint trading cards The PokePower Box® (10-BOX CASE)

As you can see in the quote in pfms post, it mentions These cards (plural)

she rules the Golgari, so we don't have a lot of options." "We can't trust her." "And yet we still need her." "You weren't there

The former was a subscription-only magazine not distributed in stores, while the latter was more widely available

Pokemon Communication (Item / Space-Time Smackdown) Swap a Pokemon card in your hand for another random Pokemon card

It's a threat your opponent can't ignore for too long

This strategy can be achieved multiple ways, most commonly with equipment, auras, anthems, pump spells, or a combination of any of these