To check if your card is part of the base set, look at the bottom right corner of the picture box
You can spend Dialga ex's Energies to retreat to Arceus ex, or use Shaymin's ability or X-Speed to retreat for cheaper if you plan on making Dialga ex the active Pokemon at a later time
I like Pious Evangel from Shadows over Innistrad in the decks that can play it as well
Value : Can fetch anywhere from $10,000 to $50,000 depending on condition
If you do, you may put a creature card from among them into your hand

Feed the Swarm Fetid Pools Fiery Islet Foreboding Ruins Frostboil Snarl Gallifrey Council Chamber Genesis of the Daleks Great Intelligence's Plan Haunted Ridge Hunted by The Family Laser Screwdriver Lavaclaw Reaches Lightning Greaves Midnight Crusader Shuttle Mind Stone Missy Ominous Cemetery Path of Ancestry Propaganda Rassilon, the War President Reliquary Tower Renegade Silent River of Tears Shadowblood Ridge Shipwreck Marsh Smoldering Marsh Snuff Out Sol Ring Solemn Simulacrum Sontaran General Stormcarved Coast Sunken Hollow Sycorax Commander Talisman of Dominance Talisman of Indulgence Temple of Deceit Temple of Epiphany Temple of Malice Temple of the False God Terramorphic Expanse The Beast, Deathless Prince The Cyber-Controller The Dalek Emperor The Flood of Mars The Master, Formed Anew The Master, Gallifrey's End The Master, Mesmerist The Master, Multiplied The Rani The Sound of Drums The Toymaker's Trap The Valeyard This Is How It Ends Thought Vessel Thriving Moor Time Reaper Vashta Nerada Vislor Turlough Wayfarer's Bauble Weeping Angel Wound Reflection Zygon Infiltrator Other Cards There are cards outside of the Doctor Who Commander decks that are considered part of the set
