so basically this is to prevent a dead weapon card in your hand? Not really in favor of an other weapon but interesting idea...
It helps stop a dead weapon in hand but could have some very useful applications. E.g. scorpions, crusaders, deja-vu, vampires (liquid puiji spark-tal maybe), overcoming light shield absorb. Basically any deck with creature that could benefit from a little extra punch, but don't want to have to increase the number of elements being used. Its also a "safer" bump than blessing, momentum, etc. since it can be reused if the creature gets CC'd