Crashing Boars

Oracle Text

Whenever Crashing Boars attacks, defending player chooses an untapped creature they control. That creature blocks Crashing Boars this turn if able.

Card Rulings

10/4/2004 If the chosen creature is not still untapped at the time blockers are declared, it does not have to block.
10/4/2004 The ability is not optional. If there are no untapped creatures to choose, then the ability does nothing.