Concealed Nerve Gas

Cloaked

While this is equipped face-down, when an attack with go again hits you, destroy this and create a Frailty token under each opponent's control.

Rulings

From the Compendium of Rathe release notes

Concealed Nerve Gas triggers while it is equipped face down and when an attack with go again hits you. Triggering this ability is optional: If the triggering condition is met while it is equipped face-down, you may choose to make this card public and trigger its effect. If you choose not to, the card remains private.
When Concealed Nerve Gas’ triggered effect resolves, you must destroy Concealed Nerve Gas, then you will create a Frailty token under each opponent’s control, beginning with the opponent to the left of you and moving clockwise around the table.

Keyword notes

Cloaked - Equip this face-down.

Cloaked is an ability keyword.
Cloaked is a game rule that changes how permanents are equipped. Cards with Cloaked that are equipped are placed face-down in the appropriate zone.
Unless otherwise stated by the abilities themselves, abilities are not functional and cannot be activated/triggered/used while the equipment is face-down (e.g. Ward).
If any Equipment with the Cloaked keyword remains equipped face-down through the end of the game, opponents in the game/tournament staff/judges at the event may ask its owner to reveal those face-down equipment cards. If asked, owners must turn the equipment face-up to allow the requesting party to validate the equipment card and the equipment zone its equipped to.

All keywords

ClassRanger

TypeEquipment

SubtypesChest, Trap

KeywordsCloaked

SetsPEN