I’d personally use it - it adds some nice damage for him. You could obviously save them both for the 2 main skill champs but you could be waiting months/years to pull them both.
I used one of my gems on him when I got him, but that was also because I love him and have wanted him for awhile. But, I also had generics waiting for certain champs. Id say he's worth it as long as you have 1 in reserve in case you get aegon or NF
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Also, love the low-key Corvus flex.