When Serrated Arrows comes into play, put three arrowhead counters on it. During your upkeep, bury Serrated Arrows if there are no arrowhead counters on it. : Remove an arrowhead counter from Serrated Arrows to put a -1/-1 counter on target creature.
HM • ENDavid A. Cherry
™ & © 1993—1995 Wizards of the Coast
Legal in: Modern,Time Spiral Block,Legacy,Vintage,Freeform,Prismatic,Tribal Wars Legacy,Singleton 100,Commander
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8/1/2008 The upkeep trigger checks the number of counters at the start of upkeep, and only goes on the stack if there are no arrowhead counters at that time. It will check again on resolution, and will do nothing if you've somehow manage to get a new arrowhead counter on the Arrows.