Planeswalker's Fury

{3}{R}: Target opponent reveals a card at random from their hand. This enchantment deals damage equal to that card's mana value to that player. Activate only as a sorcery.

The List

Planeshift

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R: Target opponent reveals a card at random from his or her hand. Planeswalker's Fury deals damage equal to that card's converted mana cost to that player. Play this ability only any time you could play a sorcery.

If the opponent has no cards in hand, then no damage is dealt.