Best use of Generic 6* AG

Is there a guide or anything around best use of a Generic 6* AG? I'm a pretty casual player and not Paragon yet so they're a rare commodity for me and plan to hold it for a bit, but I know Seatin used to have in his "tier lists" a guide on champs most worthy of a Generic AG, is such a thing still around and up to date with latest champs?
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So Shang-Chi only needs 1 sig? I was under the impression he needed high sig - sweet!
Never would have thought that Nimrod would be in the "best to gen gem" list
Also at Sig 1, critical hits inflict a burst of 10% of the hit damage.
At Sig 200, that rises to 20%.
So the ability does get better with higher Sig, but it's not a massive increase, and you might be able to do better things with 199 Sig stones.