702.142. Boast

Subrules

Boast is a keyword that adds additional rules to the activated ability that follows it. “Boast — [Cost]: [Effect]” means “[Cost]: [Effect]. Activate only if this creature attacked this turn and only once each turn.”

Effects may refer to boast abilities. If an effect refers to a creature boasting, it means its boast ability being activated.

Other rules in this chapter

Ask the judge Pro

The life counter has an AI judge that answers your play citing the exact rules. It is part of Gatewatch Pro; the rules, Oracle text and rulings stay free.