Friendly Fire #101
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$0.05
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Card Details
Target creature's controller reveals a card at random from their hand. Friendly Fire deals damage to that creature and that player equal to the revealed card's mana value.
“"Never tell goblins to 'fire at will.'" —Urut Barzeel, Mardu hordechief”
Illustrated by Anthony Palumbo
Rulings (2)
Nov 24, 2014
Cards that don't have mana costs, such as land cards, have a mana value of 0.
Nov 24, 2014
If the card has 
in its mana cost, X is 0.