Sickle Dancer — ruling 1

Whether your team controls another Warrior is checked as Sickle Dancer’s triggered ability triggers and again as it resolves. Once it gets +1/+1 this way, it won’t lose it, even if your team loses its other Warriors.

Sickle Dancer : règles, fonctionnement et interactions (MTG)

Sickle Dancer is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.

Official card text

Whenever this creature attacks, if your team controls another Warrior, this creature gets +1/+1 until end of turn.

How it works : Sickle Dancer

Original English text — Wizards of the Coast / Scryfall

#1June 8, 2018· Wizards of the Coast
Whether your team controls another Warrior is checked as Sickle Dancer’s triggered ability triggers and again as it resolves. Once it gets +1/+1 this way, it won’t lose it, even if your team loses its other Warriors.
No other card is named in this ruling.