Spell Snare counters spells with mana value exactly 2, hitting their Counterspell and Psychic Frog on the draw. Dauthi Voidwalker is an efficient evasive threat, dodging ground blockers like their Orcish Bowmasters and Psychic Frog, and its graveyard-exile ability disrupts their own Psychic Frog and Unearth-style recursion plans if they have any. This is a grindy mirror-like matchup against another disruptive tempo/midrange deck, so we want proactive threats and cheap interaction over card selection; Thought Scour and Sink into Stupor are the easiest cuts since they don't pressure the board.