When you attack wth Massacre, if you have discarded a card with 6 or more [Power] this turn, Massacre gains +2 [Power] and intimidate.
If Massacre is discarded to pay the cost of a Brute attack action card, the attack gains intimidate.
Near Mint Unlimited Normal - $2.00
Lightly Played Unlimited Normal - $1.75
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Damaged Unlimited Normal - $1.25