Whirling Dervish

Creature — Human Monk

Protection from black
At the beginning of each end step, if Whirling Dervish dealt damage to an opponent this turn, put a +1/+1 counter on it.

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2021-03-19:
Whirling Dervish’s triggered ability checks to see if it dealt damage during the turn to an opponent of its current controller. If it dealt damage to player A, then player A takes control of it, the ability doesn’t trigger.
2021-03-19:
Whirling Dervish’s triggered ability gives it at most one +1/+1 counter each turn, regardless of how many opponents were dealt damage beyond the first.
2021-03-19:
If Dunerider Outlaw dealt damage to an opponent who later left the game before that turn’s end step, its ability still gives it a +1/+1 counter.