Silent Stilettos [UPR152] (Uprising)

Whenever an attacking ally you control dies or an attack action card you control is destroyed by phantasm, you may pay {r}{r}{r}. If you do, destroy Silent Stilettos and gain 1 action point. Arcane Barrier 1 (If your hero would be dealt arcane damage, you may pay {r} to prevent 1 of that damage.)