Banshee's Blade — ruling 1

The counters stay on Banshee's Blade even if it becomes unattached, or moves from one creature to another.

Banshee's Blade : règles, fonctionnement et interactions (MTG)

Banshee's Blade 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

Equipped creature gets +1/+1 for each charge counter on this Equipment. Whenever equipped creature deals combat damage, put a charge counter on this Equipment. Equip (: Attach to target creature you control. Equip only as a sorcery.)

How it works : Banshee's Blade

Original English text — Wizards of the Coast / Scryfall

#1December 1, 2004· Wizards of the Coast
The counters stay on Banshee's Blade even if it becomes unattached, or moves from one creature to another.
No other card is named in this ruling.