Omni-Tell wants to Show and Tell into Omniscience as early as possible, backed by Force of Will and a suite of counterspells, making this another race where being first and proactive matters most. Thoughtseize strips their Show and Tell or Force of Will before they can protect their combo, and Boomerang Basics can bounce a resolved Omniscience to buy the turn you need to finish your own combo. Beseech the Mirror is too mana-intensive and slow against a deck that can win as early as turn 1-2 off Ancient Tomb, and Song of Creation's forced discard risks throwing away your own answers or combo pieces in a race this fast. Prioritize speed and disruption over card advantage in this matchup.