Omni-Tell wants to Show and Tell an Omniscience into play and then chain free spells for a lethal turn, or cheat in Emrakul, the Aeons Torn or Atraxa, Grand Unifier, so disrupting their setup is critical. Disruptor Flute can name Show and Tell or Omniscience, taxing their combo pieces by three mana at a pivotal moment and slowing their plan significantly. Hullbreacher punishes their heavy Ponder/Brainstorm cantrip suite used to find Show and Tell, converting extra draws into Treasure. Multiple copies of Disruptor Flute allow you to tax both Show and Tell and Omniscience, further disrupting their gameplan. Sink into Stupor and Lorien Revealed are too slow and non-disruptive against a deck that can win out of nowhere, so proactive taxing and hate effects are prioritized instead.