Add to that the support of Lycanroc GX, and you have a deck that's hard to beat
Biowaste Blob Bitter Ordeal Blade of Selves Blade of Shared Souls Blazing Firesinger Bloodforged Battle-Axe Bloodthirsty Adversary Blue Mage's Cane Blue Ribbon Blue Sun's Twilight Body Double Bonus Round Brain Freeze Bramble Sovereign Brass Knuckles Breeches, the Blastmaker Brenard, Ginger Sculptor Briarblade Adept Brigid's Command Broodbirth Viper Brudiclad, Telchor Engineer Burn Trail Bushy Bodyguard Bygone Marvels Cabaretti Confluence Cackling Counterpart Cadric, Soul Kindler Calamity, Galloping Inferno Calix, Guided by Fate Call of the Nightwing Caller of the Pack Caller of the Untamed Callidus Assassin Campus Composer Capricious Hellraiser Caretaker's Talent Case of the Shifting Visage Caught in a Parallel Universe Cemetery Puca Cephalid Facetaker Chain Lightning Chain Stasis Chain of Acid Chain of Plasma Chain of Silence Chain of Smog Chain of Vapor Chameleon, Master of Disguise Champion of Wits Chancellor of Tales Chandra's Regulator Chandra, Flameshaper Chandra, Hope's Beacon Chandra, Pyromaster Chandra, the Firebrand Changing Loyalty Chatterstorm Cheerful Osteomancer Chef's Kiss Choreographed Sparks Chrome Dome City of Death Clever Impersonator Clever Lumimancer Clone Clone Legion Cloven Casting Coastline Marauders Cogwork Assembler Coiling Rebirth Colorstorm Stallion Complete the Circuit
More specific to promo cards was the fact that they introduced a whole new audience to the game it was promoting
For this reason, I went with Pokmon Communication for half of my search as discarding resources with Ultra Ball (up to 8 different cards if you were to use all four Ultra Ball!) really hurts you in the long run
