yugioh frog monarch deck - Yu-Gi-Oh! Edison Format Deck Edison - Frog Monarch

The Greninja ex Twilight Masquerade Special Illustration Rare is widely considered the crown jewel of the set

Its not tied down to any one archetype, so any deck can utilize it

Also, you can utilize this to discard any useless Supporters and Trainers to take less damage from Poltergeist

That promo is now the cheapest version of this expensive MTG card, valued at $130 on MTG Goldfish

Unfortunately, this led to some crucial cards for popular archetypes being nearly impossible to obtain before a proper reprint, and that is precisely what happened with the first printing of one of the best XYZ monsters, Minerva, the Exalted Lightsworn