Maddening Imp

Oracle Text

Flying

T: Non-Wall creatures the active player controls attack this turn if able. At the beginning of the next end step, destroy each of those creatures that didn't attack this turn. Activate this ability only during an opponent's turn and only before combat.

Card Rulings

10/4/2004 If a creature can’t attack because of some restriction, or because it is tapped, it is destroyed at the end of the turn.