UB is another cantrip-heavy tempo deck built around Thoughtseize disruption and a Fantasticar-fueled draw engine, so Spell Snare is strong against their glut of two-mana spells like Stormchaser's Talent and Flow State. Force of Negation protects your own threats for free and can counter their Fantasticar or a key piece once you're tapped out from holding up Swords to Plowshares. Hydroblast cheaply answers whatever blue threat they resolve. Stifle and Consign to Memory have fewer high-value targets since their gameplan is grindy card advantage rather than activated abilities or a single bomb, and Teferi, Time Raveler is redundant with the countermagic-and-race plan you're already boarding towards.