89mm x 127mm card sleeves Perfect Barrier (100 Piece), Clear, 64 : Toys & Games Thick 4 mil polypropylene Board Game Sleeves-Double Size -

During either player's turn, when a Spell Card is activated that targets exactly 1 monster you control (and no other cards): You can negate the activation

Sure, its an investment to transform the Eye, but remember it can pay for itself, so its effectively 5 mana to craft, and the back side should more than refund itself with the very first spell you cast for free

Artworks seem a bit stale/repetitive, while overall they feel like a weird one-off gimmick

The fact that it costs only Colorless energy is a plus though, since it allows Ultra Necrozma ex to be put in any deck and still attack without waiting for the correct energy