UB Tempo (Reanimator-lite) leans on Thoughtseize, Stormchaser's Talent, and The Fantasticar backed by cantrips and Force of Will, without the Blast-effect punish that other blue mirrors have, so Consign to Memory becomes a strong tempo play to bounce and strand a key creature or Fantasticar activation. Surgical Extraction can strip a Thoughtseize'd or graveyard-bound threat, and Unholy Heat cleanly kills their early Delver-style or Fantasticar tokens with delirium online. Flow State loses some value since they don't over-invest in blue spells worth countering as heavily as a true mirror, so a few copies make room along with Prismari Charm. Play around Thoughtseize by sequencing Force of Will protection carefully and race with Dragon's Rage Channeler.