Many Eldar lists feature Fire Dragons. If you don't have high AV enemies to target, fire dragons do very well against nob bikers, point for point. You just want to drop them off on the other side of the nob bikers, so that the nobz end up charging away from the main body of your army (because you typically won't have enough firepower to kill many or most nobs, just one or two. So your FD's are going to die.)
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