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You cannot evolve a regular Sandshrew into Brocks Sandslash, and you cannot evolve a Brocks Sandshrew into a regular Sandslash

You cannot choose to have it enter the battlefield as a creature

In the Magic: The Gathering TCG, planeswalkers have their own card type, though - apart from Battles, which have only shown up in the one set - they're the rarest type of card, and many decks won't even contain one

If a creature the defending player controls can't block the creature targeted by the last ability for any reason (such as being tapped), then it doesn't block that creature

Simply put, it's because it doesn't add any restriction on how you can spend your mana