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Mark Rosewater has said on his blog that future battles might not be Sieges and might not be double-faced cards, but for now theres only one style of battle card to worry about

Almost any other weapon is better

The first one just adds mana to your side of the field, but the second one adds any color mana to your side of the field that can only be used to cast a legendary spell, adding the boon that the spell cant be countered at all, which can be incredibly useful against higher level opponents

Giving such an effect a keyword, however, that makes the game a little easier to understand is a net positive for Magic