Azlask, the Swelling Scourge Brisela, Voice of Nightmares Emrakul, the Aeons Torn Emrakul, the Promised End Emrakul, the World Anew Hanweir, the Writhing Township Herigast, Erupting Nullkite Kozilek, Butcher of Truth Kozilek, the Broken Reality Kozilek, the Great Distortion Ulalek, Fused Atrocity Ulamog, the Ceaseless Hunger Ulamog, the Defiler Ulamog, the Infinite Gyre Zhulodok, Void Gorger
Now, a barrage of upkeep triggers from Subversion and Palace Siege wont exactly lead to an engaging play experience, but they do reinforce a unique take on the archetype: slowly draining the table until one player finds themselves at a slightly lower life total than the others
Broader economic trends play a huge role in what people are willing to spend on collectibles
The biggest concern with playing monocolor decks around a niche mechanic like energy is the limited pool of cards available, but Nissa really patches any holes on both sides of your gameplan