Have to agree that it should be a permanent. Right now, it's just much easier to use the weapon you have in mind.
Also, what do you mean by "common weapon"? Do you mean all of the unupgraded ones? For some reason, the first time I saw it, the only ones I thought were common were the cheap non-elemental ones.
Yeah Longsword Hammer and Dagger
Upped generated Non-Upgraded rares (The elemental ones)
Dagger costs 0, Short Sword costs 1, Hammer costs 2. If it's not perm, how are you justifying the extra 5 (at best) specific quanta?
I have to agree, it needs an increase in power. Make it at least possibly generate elemental at first and upgraded elemental after, make it permanent, or maybe both with cost tweaks. You only have 6 flying weapon, and any permanent destruction can target it instead of your weapon.
But that is why I made Forge HALF the cost of Smith. Forge can be easily fit in with mono earth. But Smith needs 10 earth AND 4 fire, so its really 14, not 10.
And it breaks the strict mono-element usage, because it requires fire. Also, seeing how the rares can be any of 12 elements, it would ALSO possibly require all of the other towers, or quantum towers. So it balances itself out with its mono-rainbow property placement, because with the upped version, you pretty much need a rainbow, but unupped can be used rainbow OR mono.