Maddening Imp — ruling 1

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

Maddening Imp : règles, fonctionnement et interactions (MTG)

Maddening Imp is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.

Official card text

Flying : 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 only during an opponent's turn and only before combat.

How it works : Maddening Imp

Original English text — Wizards of the Coast / Scryfall

#1October 4, 2004· Wizards of the Coast
If a creature can’t attack because of some restriction, or because it is tapped, it is destroyed at the end of the turn.
No other card is named in this ruling.