Protection is a big factor here, so the likes of Lightning Greaves, Whispersilk Cloak, and Asceticism are all going to be excellent choices for keeping poor old Grolnok alive
The Commander format above all seeks to promote a casual and social experience, and cards like Nadu arent in line with that ethos
Cascade (When you cast this spell, exile cards from the top of your library until you exile a nonland card that costs less
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after we put in a few other flavor-fitting cards, of course
Needing three other Islands in play isnt much of a deterrent for a deck thats already playing Cryptic Command