Legend is pretty great for WOH while in Silver. When it comes to Gold the Legend is stupid expensive, it costs alot more than a keeper does to upgrade. With that said inGold I prefer leveling a keeper opposed to my legend, at least until you have plenty of XP to spare.
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There doesn't appear to be a set multiplier. At least(and fortunately) not for pxp and I assume, for lxp and/or gold.