That creature then cant attack you, so itll have to focus on other opponents or soak up a removal card or other ability
BPhillipYork: That's a fairly aggressive mill card, easy to trigger, and if you have ways to leverage mill it will get fairly nasty in short order
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If a creature card was exiled this way, you may have Lazav become a copy of that card until end of turn
Bloodbraid Elf, Qasali Pridemage, Rakdos Charm (which has been performing incredibly well so far), Izzet Charm, Sphinx of the Steel Wind, Olivia Voldaren, Lotleth Troll, Edric Spymaster of Trest, Lightning Helix, Shardless Agent or Geist of Saint Traft all of which are so similar in their power
It's not surprising that this is one of 151's most desirable cards, and it currently goes for around $390