This is a solid card. It's basic utility serves to demonstrate how worthless his Gambit's Staff card is. In a protection build, this is a permanent version of Desperate Defense or Indomitable. This is amazeballs. I love this card.
Hero Response: After Gambit defends against an attack and takes no damage, exhaust Gambit's Guild Armor → ready Gambit.
Members of the Thieves Guild wear custom armor to protect themselves from assassins.
Gambit #5. Gambit #4.