Charlie, Mystic Traveler

If Charlie, Mystic Traveler is cast from the hand, target player reveals their hand. You may cast a
card from that player's hand for free.
If Charlie, Mystic Traveler is cast from the graveyard, you may cast a card from target
player's graveyard using mana of any color.
If Charlie, Mystic Traveler is cast from exile,
exile all other creatures on the battlefield.