You can't use your other removal, because he's black, unless you have something with protection from black, in which case he's temporarily something else
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As a result, it's often better to let an attack through rather than risk losing Prosper to a post-combat removal spell or combat trick
Instead, for just one generic mana, you can attach it to any creature an opponent controls, goading it and giving it +2/+0
You can get a Swords to Plowshares to exile a creature thats indestructible, a Boros Charm to make your permanents indestructible until the end of the turn, or a Generous Gift to destroy any big, bad permanent and leave your opponent with a 3/3 Elephant instead