Serrated Arrows

Serrated Arrows {4}

Artifact
Serrated Arrows enters the battlefield with three arrowhead counters on it.
At the beginning of your upkeep, if there are no arrowhead counters on Serrated Arrows, sacrifice it.
{T}, Remove an arrowhead counter from Serrated Arrows: Put a -1/-1 counter on target creature.
Set: [TSB] Time Spiral "Timeshifted" ( S )