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Everythingamajig For the first ability, if I move a counter onto a planeswalker, does it become a loyalty counter

and do not exist in the Commander format

Neither of the lands do anything with the type, but in the past this has been used with types like Gates(in Battle For Baldurs Gate and Foundations ), Deserts (most recently in Outlaws of Thunder Junction ), and several other times

That might sound like a lot of protection, but think of it like this: If your deck is completely shut off when the commander or a similarly critical piece isnt in play, your opponents can beat you with a Swords to Plowshares or two