villainous card sleeves Sleeve Kit Protect cards from wear and tear during play with Card Sleeves featuring Enchanted card art of Ursula – Deceiver of All Jay Villain Card Sleeves –

Gains 100 ATK for each Spell in your GY

So many artifacts hit the board, such as mana producers (Sol Ring or Signets), land fetchers (Expedition Map and Armillary Sphere), utility artifacts (Nihil Spellbomb and Dispeller's Capsule), artifact creatures (Solemn Simulacrum and Steel Hellkite), broken artifacts (Mind's Eye and Eldrazi Monument) , and Equipment (Swords of X and Y and Lightning Greaves)

it can be used to make space to Special Summon more "Mekk-Knight" monsters, and, if either "World Legacy Key", "Secret" or "Whispers" is active, can disrupt the opponent's plays by moving a "Mekk-Knight" to the same column as opposing cards

As you can see, as this card only allows you to use it for Ancient Pokemon which only exist in Paradox Rift at present its not likely to pop up in any decks that arent based specifically around that type of Pokemon

Phyrexia: All Will Be One is a return to the tortured world of New Phyrexia years after Phyrexias triumphant return to Magic: The Gathering