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But on the other hand, if youre playing against a control deck, Tenacious Underdog can provide you with a threat that is resistant to removal and draws you an extra card every turn in the late game for four mana

You may choose to remove Sarulf's +1/+1 counters even if that would cause lethal damage to be marked on Sarulf

This might explain why its banned in Historic and remains on the Game Changers list for Commander

Now, to be fair, for someone who doesnt play Magic and doesnt recognize the reference, its not anything major

(2013-09-15) Heroic abilities will trigger only once per spell, even if that spell targets the creature with the heroic ability multiple times

(2014-11-24) At any time, you can look at a face-down permanent you control