Omniscience Combo needs to resolve Omniscience and chain spells to win on the spot. Annul, Disdainful Stroke, and Negate form a critical counterspell package targeting Omniscience, Stock Up, and Consult the Star Charts. Hydro-Man, Fluid Felon provides additional threats with evasion that apply fast clock pressure forcing them to combo before they're ready. Your Eddymurk Crab and Hearth Elemental attack force them to spend mana on blockers rather than combo assembly. Abrade and Sear are dead with no relevant targets, Bounce Off and Spider-Sense are too situational, and Abandon Attachments is removed since they have enchantments but their combo pieces need counterspells more than enchantment removal.