In most games of Commander, activated abilities on lands and creatures from your opponents are going to pop with regularity
Use the toughness of the creature as it last existed on the battlefield to determine whether or not Massacre Girl's ability triggers
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Did I mention its also a proactive card
That said, with some solid ramp, removal options, and a few spells that can end the game in short order, this thematic deck is no slouch
"It's basically the exact same issue as chipping on the back of cards, but on the front, it is considered 'silvering' because of its color," explained Pratte