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Many dinosaur EDH decks have tools to cheat big dinosaurs into play, so the 7-mana casting cost shouldnt be a problem

You will not be able to access all of your mana properly if you dont give yourself some kind of leg up

If, by some chance, it isn't included in the explore-themed Merfolk commander precon coming with Lost Caverns of Ixalan the price will likely spike some when the deck releases

Not all cards are weaker after rebalancing

I started out with every Nicol Bolas, searched for every card with Bolas in the title, expanded the search to Nicol Bolas quoted in flavor text, and finally checked all the various cards that depict various Nicol Bolas-related things