pokemon assorted cards Holo Rare Pack scattering foil effect applied to the cards artwork Maxterz Pokemon Cards Foil Card

A single grade difference can mean hundreds or thousands of dollars

Ancient Silver Dragon April, Reporter of the Weird Arm-Mounted Anchor Azra Oddsmaker Battle Angels of Tyr Bebop, Skull & Crossbones Book Devourer Captain Howler, Sea Scourge Cold-Eyed Selkie Curie, Emergent Intelligence Damocles Base, Sword of Kang Diviner Spirit Fear of Failed Tests Foot Chopper Glenn, the Voice of Calm Glint-Eye Nephilim Hunter's Insight Hunter's Prowess Impaler Shrike Iymrith, Desert Doom Jolrael, Voice of Zhalfir Kain, Traitorous Dragoon Korvold, Gleeful Glutton Mask of Memory Mask of the Schemer Merfolk Windrobber Mighty Servant of Leuk-o Nael, Avizoa Aeronaut Neheb, Dreadhorde Champion Nimble Brigand Ogre-Head Helm Peema Trailblazer Professor Hulk Psychic Frog Robe of the Archmagi Sauron, the Dark Lord Sergeant John Benton Shadow, Mysterious Assassin Shoreline Looter Starwinder Sturmgeist Subterfuge Summon: Primal Odin Surrakar Spellblade The Gitrog, Ravenous Ride The Pride of Hull Clade Trash the Town Xyris, the Writhing Storm Zombie Cheese Magician

At least five of the cards in their deck and sideboard had to come from each of the legal sets, and those legal sets included Homelands

So if you add three grass energy to Celebi ex, Serperior will give you additional energy and allow you to flip the coin six times for Celebi exs attack