Impetuous Devils
Creature — Devil
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.
Filip Burburan
Eldritch Moon (EMN)
• #132Rulings
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.
(wotc • 2016-07-13)
Rulings
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.
(wotc • 2016-07-13)