Pokemon Shoes (speculated): If the Pokemon this card is attached to is switched with your Active Pokemon, heal 30 damage from that Pokemon
Getting a permanent out of your deck every single turn is somewhat of a pipe dream
Sure not as broken as Karn, but at least it cant be targeted by creatures
Thats what makes the prospect of doing a for keeps Vintage Cube draft where the cards you pick for your deck are yours to take home so unique and exciting

Holds standard trading card in a sleeve 20 pt. thickness 2 piece design w/gold magnet Exterior Dimensions: 2.925" x 4.345" x .320" Interior Dimensions: 2.660" x 3.727" x .024"_These Pro-Mold Magnetic Card Holders have a recessed area that is large enough to accommodate the included, specially-sized sleeve. These sleeves are an added layer of protection for the enclosed card. This is especially important if you are protecting a shiny foil card, as the foil layer can get scratched if dust was on the card when it was placed in the magnetic. Using a sleeve minimizes the chance of the foil card getting scratched. There are many branded and hobby community names for these reflective foil cards, including: Chrome (Topps Bowman), Refractor/Superfractor (Topps), Otic (Panini), silver, rainbow, reflective, holo, Prism (Panini), Pulsar (Panini), colored refractor parallels, and more.This listing is for 10 holders

The key to these cards, with Grenzo especially, is using scry/filtering effects to set up the bottom of your library for big plays