Dimir Terror shares the mill-into-Tolarian-Terror plan of the mono-blue version but adds black removal like Snuff Out and Agony Warp, plus Sneaky Snacker as a recurring threat. Unable to Scream is the key card, neutralizing a cheaply-cast Tolarian Terror or the graveyard-recurring Sneaky Snacker by stripping its abilities and shrinking it to 0/2. Dispel protects your spells from their Counterspell or stops Snuff Out from answering your own threats, while Envelop hits their card draw sorceries like Lorien Revealed. Prioritize resolving Unable to Scream on whichever big Serpent threat lands first, since letting it survive combat resets their tempo advantage.