Professor Sada's Vitality allows players to take two basic energy cards from their discard pile and attach them to any Ancient Pokmon they control , however they choose

Abaddon the Despoiler Abyssal Persecutor Acererak the Archlich Aclazotz, Deepest Betrayal Ad Nauseam Admiral Beckett Brass Admiral Brass, Unsinkable Agadeem's Awakening Alela, Artful Provocateur Alela, Cunning Conqueror All-Out Assault Alpharael, Stonechosen Altar Ibn-La'Ahad Aminatou, Veil Piercer Aminatou, the Fateshifter Anafenza, the Foremost Ancient Brass Dragon Angel of Suffering Angrath, Minotaur Pirate Angrath, the Flame-Chained Anguished Unmaking Anhelo, the Painter Anikthea, Hand of Erebos Anje Falkenrath Anowon, the Ruin Thief Aphelia, Viper Whisperer Archfiend of Despair Archon of Cruelty Arguel's Blood Fast Army of the Damned Arna Kennerd, Skycaptain Arvinox, the Mind Flail Ashcoat of the Shadow Swarm Ashcoat of the Shadow Swarm Ashen Rider Ashiok, Nightmare Muse Ashiok, Nightmare Weaver Ashiok, Sculptor of Fears Ashiok, Wicked Manipulator Ashnod the Uncaring Athreos, God of Passage Athreos, Shroud-Veiled Atraxa, Grand Unifier Atraxa, Grand Unifier Atraxa, Praetors' Voice Auntie Ool, Cursewretch Avatar of Woe Awaken the Blood Avatar Azula, Ruthless Firebender Baron Von Count Be'lakor, the Dark Master Begin the Invasion Behold the Beyond Behold the Sinister Six

Well, its close enough for the somewhat novelty number 0 spot at least
Although not every creature in the deck specifically cares about Energy, nearly all of them play well with Guide of Souls to amass enough counters that the Guide can then turn itself or other attacking creatures into bigger, flying threats
What he didn't expect was that the next big driver of his growth would be an e-commerce platform that launched in the U.S