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No, the player isnt required to pay to attack

That's how you make both an entrance and an exit

This works in loads of black decks, such as Zombie tokens (as it doesn't specify 'nontoken') or, of course, sacrifice-heavy Aristocrats decks

Keldeo ex - 167/086 Keldeo ex has quickly become one of my favorite cards from White Flare because of how much flexibility it gives in battle

Thankfully, some of that cost is offset by the fact that Chandra gives you two mana upon entering the battlefield and will copy any instant or sorcery spell you cast with that mana immediately

While only you can answer the first question, the second question is a little more straightforward