Probably the strongest Horror synergy in Standard involves Thing in the Ice's transform ability, which bounces all creatures except Horrors
Tomik, Distinguished Advokist Unbreakable Formation Urbis Protector Aetherplasm Bruvac the Grandiloquent Cerulean Sphinx Cloudfin Raptor Compulsive Research Copy Enchantment Cyclonic Rift Downsize Drift of Phantasms Eyes Everywhere Fblthp, the Lost Helium Squirter Kasmina's Transmutation Keymaster Rogue Kiora's Dambreaker Leapfrog Muddle the Mixture Murmuring Mystic Nightveil Sprite Persistent Petitioners Pteramander Quasiduplicate Quench Quicken Radical Idea Remand Repeal Sinister Sabotage Spark Double Tidespout Tyrant Totally Lost Vedalken Mesmerist Balustrade Spy Blade Juggler Bladebrand Burglar Rat Crypt Ghast Dark Confidant Debtors' Transport
Additionally, these cards feature a recessed hologram at the bottom, further enhancing their authenticity
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UB can play off the same strong commons and uncommons as UR does, and it has some great expensive spells to pair them with like Sephiroth's Intervention, Ice Magic, Dreams of Laguna (flashback), and Sidequest: Hunt the Mark