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The idea is to have two Underground Sea in play and you dont really want more than that, although its not terrible to have three

So, assuming you're willing to drop approximately $450 USD all at once, you could potentially have enough Island cards for a full deck

But listening to the Commander Chronicles series on Gavin Verheys Good Morning Magic YouTube channel where he and Melissa review the Commander products over the years reassures me that Melissa very much understands what makes cards and mechanics that are good for Commander, and I very much look forward to seeing the influence of the Casual Play Design team percolating up through upcoming sets

Starting with just one Adrix and Nev equipped with a Helm of the Host will give you two more during the first combat step you have them out