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Another tip that might save you some money is to build and test the deck on Magic Online

Want to learn more about getting the best out of your tech

Landfall decks will obviously benefit most from this, but even Dragon decks that play plenty of fetchlands can make it work

Pawpatch Formation This is a really flexible green instant and should likely be in most green Commander decks

While there are fewer colorless commander options available than there are commanders of other color identities, there are still several powerful legendary creatures available for those looking to construct a colorless commander deck

Vren the Relentless is a Rat Rogue that can create an enormous army of humongous rats that will chew opponents to pieces