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Even if somehow that was not the case, I still do not think this justifies a mid costed Uninkable in your deck

Especially since you'll likely be running Tamatoa - So Shiny

Deekah will make 8 tokens and 6 of them at instant speed and with a 7 cost Commander you likely have the mana for three 2s and one 1 each round after you have resolved it

Grim Monolith: Reserved List, popular in Commander, expensive black-bordered counterpart

If you missed these cards when they were originally released, this could be a good way to get your hands on a piece of TCG history - with a special stamp that marks it out from the original, of course