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Anafenza, the Foremost Archive Haunt Bloodchief Ascension Catlike Curiosity Centaur Vinecrasher Compost Countryside Crusher Dennick, Pious Apparition Dimir Strandcatcher Disa the Restless Duskmantle Guildmage Dutiful Knowledge Seeker Forbidden Crypt Lazav, Dimir Mastermind Lorcan, Warlock Collector Nihilith Planar Void Profane Memento Quest for Ancient Secrets Robot Domination Sand Scout Sefris of the Hidden Ways Skola Grovedancer Slogurk, the Overslime Soulcipher Board Syr Konrad, the Grim Tamiyo, the Moon Sage The Dark Barony The Gitrog Monster The Haunt of Hightower Turntimber Sower Ultron the Annihilator Ultron's Auxiliary Voracious Brood Vulturous Zombie Yuma, Proud Protector
Essentially, there isnt too much of a cost associated with playing the majority of Energy cards because such a wide berth of various effects have been printed that provide it
She shows up through reanimation , Show and Tell, or Through the Breach