Background

Phantom Blades

Shivs gain Retain. The first Shiv you play each turn deals 9 additional damage.
Silent
Power
1
Uncommon

Phantom Blades+UPGRADED

Shivs gain Retain. The first Shiv you play each turn deals 12 additional damage.
Jorbs
Jorbs
Jorbs
Quite a lot of damage to add to a Blade Dance in Act 1; instead of playing every Shiv in one turn you can play one per turn and deal 39 with them instead of 12. Phantom Blades is a little limited in terms of lategame scaling, but might help you survive long enough to find more exciting cards.