If that player doesnt, they reveal a card at random from their hand
(2014-11-24) If two players have each cast Channel Harm targeting a creature the other controls, and a source one player controls would deal damage to the second player or a permanent that player controls, one Channel Harm will prevent that damage and try to deal damage to the creature controlled by the first player
When Planeswalkers were released, in Lorwyn, Wizards needed to dedicate themselves, over the course of sets, to creating efficient answers for them in addition to counterspells
Those decks will often have a few copies of [c]Lotus Petal[/c] available in case you dont have enough mana to play Thassas Oracle from your hand
Getting duplicates of any creature that arrives on the battlefield is awesome
Its worth only whatever the buyer paid for it, probably less than a dollar