How do I hide an ability?

[xXMephistoXx]

I have an "Engineering" ability, which isn't supposed to show or use up space, how do I hide it?

 

[Aeroblyctos]

Trigger:

• Player - Disable Acid Bomb for Player 1 (Red)

 

[Eccho]

Was that really what he meant? it is the right action but... If you want to "hide" a spell while still having its effect running you should make a spell book with the ability inside, and then:

• Player - Disable <Your SpellBook> for Player 1 (Red)

 

[xXMephistoXx]

His way works, since the spell is only supposed to initiate the effect, not continuely uphold it. Thanks to both, anyway!