A sorcery-speed spell wont do much when your opponent casts Entomb and Reanimate in the same turn
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However, it can only be seen once its completed
Turning the targets into treasures is certainly a drawback since it gives players the option to turn their useless card into mana, but ironically players will often crack their treasure and lose the opportunity to get their card back when Kitesail Larcenist leaves the battlefield
Then, other non-human creatures you control get +1/+1, so your ghouls already out are getting buffed, and on top of that, they have undying, meaning theyre resurrected with a +1/+1 counter if they died without one
When combined with visual inspection, scanning can become a useful anti-scam tool