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Instead, Grenzo can only cheat out a spell that costs three mana or less each turn

A quick search online shows that outside Morophon, the Boundless (which isnt even a real Eldrazi, by the way), theres not a dedicated Eldrazi 5-color commander

Call of the Wild lets you do this effect just to yourself every turn

But you can pick of a PSA 8 shadowless (not 1st) for anyone short of Charizard for that price, so its not as bad as it could be

1 Vega, the Watcher

Of course, you could always just use it in a deck that cares about the number of card or permanent types you have, like finding a way to sac it to make Korvold, Gleeful Glutton cheaper to cast