YAS ability spam was on par with pre-nerf Starfire Protocol and Heart of Inmost Light, except neither of those were even remotely good in PvP.
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HOIL actually was pretty good in PvP before they nerfed it. Also YAS was most definitely never on par with pre-nerfed Starfire or HOIL. Starfire only required an Empowering Rift or a Well and then to just damage an enemy with your weapons. HOIL allowed you to constantly spam abilities no matter what you use. YAS required you to do a full combo of abilities to use it properly.
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No, it was not on par with starfire.