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I have this land card that can be tapped to become any land. I also have some creatures that become more powerful from a specific land, like Flinthoof Boar and Arctic Aven, as well as a few others. So my question is, if I tap that land card, say as a Mountain, will Flinthoof Boar get more powerful?

So, planeswalkers count as players? Meaning you can't return them to your hand from the graveyard with spells for creatures?