Impetuous Devils — ruling 1

If a creature affected by the first triggered ability of Impetuous Devils is tapped or is affected by a spell or ability that says it can’t block, then it doesn’t block. If there’s a cost associated with having that creature block, its controller isn’t forced to pay that cost, so it doesn’t have to block in that case either.

Impetuous Devils : règles, fonctionnement et interactions (MTG)

Impetuous Devils 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

Trample, haste When this creature attacks, up to one target creature defending player controls blocks it this combat if able. At the beginning of the end step, sacrifice this creature.

How it works : Impetuous Devils

Original English text — Wizards of the Coast / Scryfall

#1July 13, 2016· Wizards of the Coast
If a creature affected by the first triggered ability of Impetuous Devils is tapped or is affected by a spell or ability that says it can’t block, then it doesn’t block. If there’s a cost associated with having that creature block, its controller isn’t forced to pay that cost, so it doesn’t have to block in that case either.
No other card is named in this ruling.