Does this turbo gasket look reusable?

[Ender]

it already looks a bit flat to me, but the pic isn't great. I don't think the warpage there is what will hurt you, it'll be if it's cracked, if the mating surfaces are uneven, and if it's so flattened out that there's hardly any more give to the gasket (which you won't really be able to tell except by eyeballing how smashed it is). worst case it blows out then you run sans gasket for a little while. if your manifold and turbo mate nicely you can get away with no gasket for a time, but it WILL leak unless you have perfectly flat surfaces.