I don't think shutdown mesmers in general are of much use in AB. Shutdown mesmers help a team win battles, but that's not the point of AB. You won't be able to cap without help, and with help you won't be contributing much to the actual capping. You also won't be able to pick off stragglers by yourself, and you'll have a hard time surviving on the way back to group after rezing.
For straight capping, all mesmer builds fall short, but if you want to make a useful mesmer for AB anyways, arcane echo, shared burden, and mantra of persistence will let your party be able to run from almost any battle and cap like crazy. Illusion of haste is also a good spell to bring, especially along with plague sending. Alternatively, if you want to be able to pick people off at will, crippling anguish + phantasm + images of remorse + accumulated pain will kill almost anyone without monk support, and in the case of warrior they'll be useless in the long time it takes them to die.
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