As youll see if you search up Espeon ex Tera, this ones a bit trickier to use than other exs
Previously, wildcards could be found randomly within booster packs and were also gradually accumulated as a reward for opening up those packs
These cards are quite rare and are already fetching a decent price on the secondary card market, with Fezandipiti being the most valuable among them

Astrologian's Planisphere Atlantean Cavalry Bard the Bowman Baxter, Fly in the Ointment Blue Marvel, Adam Brashear Chasm Skulker Clinquant Skymage Construct a Cosmic Cube Erudite Wizard Faerie Vandal Gurgling Anointer Hoofprints of the Stag Iron Man, Armored Avenger Jace's Projection Jace, Arcane Strategist Kang, Temporal Tyrant Kianne, Corrupted Memory Kid Loki Knights of Dol Amroth Knowledge Seeker Lady Octopus, Inspired Inventor Lakeshore Apothecary Lat-Nam Adept Lorescale Coatl Lyla, Holographic Assistant Madame Masque Merata, Neuron Hacker Nadir Kraken Ominous Seas Oneirophage Ravenhill Flock Roxxon Brutes Shabraz, the Skyshark Shang-Chi and the Ten Rings Stalwarts of Osgiliath Stark's Ingenuity Teferi's Talent Teferi, Temporal Pilgrim The Astonishing Ant-Man The Watcher in the Water Thopter Mechanic Toothy, Imaginary Friend Vodalian Wave-Knight Wizard Class Wolfbat

Cost reduction has the benefit that it can be played as soon as turn one (if using Kinjalli's Caller) and scales very well when casting multiple Dinosaurs in a turn
The ability to opportunistically take out a key artifact or enchantment is some solid upside