We already have Flying weapon. This game shouldn't focus too much in all kinds of crazy weapon spells.
Flying Weapon decks are too susceptible to bad draws. A CREATURE with the Flying Weapon ability can take care of that; and it allows you to animate infinite weapons, not just 6.
And I'll change Dual Wield to costing nothing.
I'd prefer certian abilities to belong to certain elements, like if only Air could turn weapons into creatures and only Earth could turn weapons into permanents, but then again I don't like upgrades going colourless in the actual game too, so it's probably just me.
Abilities like those should be available to all elements. At least that's my opinion. If you want me to back it up, then to me it seems that animating and/or automating weapons don't seem to be related to Air/Earth. Since there are weapons for all elements, the abilities to use multiple weapons should be available to all elements.
And it would be a pain to splash Air or Earth just to use Armory or Weapon Master.