pokemon trading card game mewtwo box TCG: Team Rocket's ex ready deck Pokemon Mewtwo V-UNION Special Collection

Foil effects are especially popular for custom MTG cards, particularly for commanders, showcase cards, cube staples, and collector-style projects

And any other card on the list for that matter

Now sure, you have to spend the mana, it has to be in your graveyard, and it exiles itself if it heads back to the graveyard

It has no combat keywords though, so it's unclear how often it's going to survive combat to keep the attrition going

While this would already complicate box openings (since most packs will be losers, from a value perspective), the high bulk-rare rate could be redeemed if the rest of the slots were filled with really solid, high-end rares