Adrenaline Addiction

Enchant player
At the beginning of enchanted player's upkeep, exile the top card of that player's library. Then
he or she flips a coin. If he or she wins the flip,
he or she may play that card this turn. If he or she loses the flip, Adrenaline Addiction deals damage equal to the exiled card's converted mana cost to enchanted player.
"Boredom is the last thing I want."