These Are Protective Sleeves To Put Each Card In Individually To Protect Cards From Scratches
Wizards of the Coast wasnt happy with the print quality of Summer Magic (also referred to as Edgar) because the cards were printed too darkly, and there were other errors that cropped upmost famously Hurricane was printed in a blue border instead of green
Then, should ZeigGreymon get deleted, it can play a Blue Flare Digimon with cost five or less from under one of your tamers and Save itself, thus maintaining your board presence
You can prevent Sableye from sniping it with Lost Mine without a Jirachi in play, Technical Machine: Devolution might be another valid option to block, and of course Special Conditions are always looking for an opportunity to strike
However, one can be any color, and the other must be green
Cards like Hashaton, Scarab's Fist weaponize discarding cards while reanimation engines like Zul Ashur, Lich Lord paired with other cards like Reanimate and Buried Alive keep the undead coming back for more