tireless
Tireless Tracker was on the battlefield (gets a +1/+1 counter when a Clue is sacrificed). Red Herring was on the battlefield as well, and when I paid 2 to sacrifice Red Herring and draw a card, Tireless Tracker got a counter.
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Kenobz#13433
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DAC169#34537 commented
Red Herring is an "Artifact Creature — Clue Fish."