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Ethersworn Sphinx Now this is a cool card

The ultimate pretty much spells doom to whoever's on the receiving end

Honorable Mention: Top Five Non-Ixalan Dinosaurs [casthaven]Fungusaur[/casthaven] Fungus

Nurgle's Conscription Reverberate Sorcery (7) Blasphemous Act Blight Grenade Decree of Pain Deny Reality Let the Galaxy Burn Mandate of Abaddon Past in Flames Enchantment (5) Nurgle's Rot The Horus Heresy The Lost and the Damned The Ruinous Powers Warstorm Surge Artifact (10) Assault Suit Chromatic Lantern Commander's Sphere Drach'Nyen Sol Ring Talisman of Creativity Talisman of Dominance Talisman of Indulgence Wayfarer's Bauble Worn Powerstone Land (38) Barren Moor Command Tower Crumbling Necropolis Dismal Backwater Evolving Wilds Exotic Orchard Foreboding Ruins Forgotten Cave Molten Slagheap Path of Ancestry Sunken Hollow Swiftwater Cliffs Temple of the False God Terramorphic Expanse Island x8 Swamp x8 Mountain x8 Commanders, Theme, and Strategy The two main Commanders for The Ruinous Powers are Abaddon the Despoiler and Be'lakor, the Dark Master