Helm of Lignum Vitae

If there are 4 or more Earth cards in your banished zone, this gets +1

.

Blade Break

Rulings

From the Rosetta + 1st Strike release notes

This has a static ability which constantly checks the number of Earth cards in your banished zone. If this is defending with 3 Earth cards in your banished zone, and then you banish an Earth card, this gets +1. If you then remove an Earth card from your banished zone, it loses the +1.
Earth cards that are face-down in your banished zone do not count towards Earth cards in your banished zone.

Keyword notes

Bladebreak - Equipment that are fragile and break after being used to defend. If you defend with a card with Blade Break, destroy it when the combat chain closes.

When you defend with a card it remains on the combat chain until the chain closes, therefore you cannot defend with an equipment multiple times on the same combat chain.
When this card is destroyed, it is sent to your graveyard.
The ability becomes a layer on the chain when the combat chain closes.
The Blade Break ability becomes a layer on the chain when the combat chain closes.
The ability goes on the stack when the combat chain closes.

All keywords

TalentEarth

TypeEquipment

SubtypesHead

Defense1

KeywordsBlade Break

SetsFLR, LGS, ROS, VER