Echo Circlet — ruling 1

Destroying or unequipping the Echo Circlet after blockers have been declared will not undo any blocks made by the equipped creature.

Echo Circlet — ruling 2

Echo Circlet’s effect is cumulative. If it equips a creature that can already block an additional creature, now it can block three creatures. The same is true if two Echo Circlets equip the same creature, for example.

Echo Circlet : règles, fonctionnement et interactions (MTG)

Echo Circlet 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 can block an additional creature each combat. Equip

How it works : Echo Circlet

Original English text — Wizards of the Coast / Scryfall

#1January 1, 2011· Wizards of the Coast
Destroying or unequipping the Echo Circlet after blockers have been declared will not undo any blocks made by the equipped creature.
No other card is named in this ruling.
#2January 1, 2011· Wizards of the Coast
Echo Circlet’s effect is cumulative. If it equips a creature that can already block an additional creature, now it can block three creatures. The same is true if two Echo Circlets equip the same creature, for example.
No other card is named in this ruling.