Inventory at lvl 50

I was curious… I am lvl 50 and am curious if I get sigil… will I have enough inventory to r3 a 6 star? This post is actually to help my friend because he is considering buying the sigil so he can r3 a champ. But he doesn’t want to buy it if it won’t let him r3. I would appreciate any feedback possible. Thanks guys!
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Why are you Karnak?