As absurd as the idea of a big box retailer trading in Pokemon slabs sounds, this is perfectly on-brand for GameStop
However, it's crucial to view these apps as an estimate
Currently, Riolu's card is valued at $8.51 USD on TCGPlayer
A couple of key options include: Academy Manufactor FEAs , $16 and climbing with plenty of existing EDH demand being expanded upon with the advent of this food deck Boon Reflection , last seen in Double Masters and available near $5 in both foil and non-foil though it could see a reprint in a Secret Lair or Commander Masters this year Rhox Faithmender foils, single printing from 2013, currently near $10 but headed to $20+ if it doesnt catch a reprint Feasting Troll King is a solid threat in this deck if your mana base can support it, and FEAs are single printing, low supply and sitting at about $10
And while this one doesn't offer a powerful, mechanically unique ex Pokemon, it does feature everyone's favorite chompy boy, Gible