Hellbent / Versessenheit
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Hellbent is an ability word that indicates that a spell or permanent is better if its controller has no cards in his or her hand. Only cards from the Rakdos guild (black, red, or black-red) have hellbent.
Demon's Jester
If a hellbent ability of a permanent is a triggered ability, the number of cards in the permanent's controller's hand is checked both when that ability would trigger and when that ability would resolve. If the player has one or more cards in his or her hand when the ability would trigger, it won't trigger. If the player has one or more cards in his or her hand when the ability would resolve, the ability does nothing.