Background
All Cards
Dagger Throw1
Deal 9 damage.
Draw 1 card.
Discard 1 card.
Dagger Throw+1
Deal 12 damage.
Draw 1 card.
Discard 1 card.

Dagger Throw

Deal 9 damage. Draw 1 card. Discard 1 card.
Silent
Attack
1
Common

Dagger Throw+UPGRADED

Deal 12 damage. Draw 1 card. Discard 1 card.
Jorbs
Jorbs
Jorbs
In Slay the Spire 1, Silent's Discard synergies were a common way for her to win the run, and so Dagger Throw's "Discard 1" line was a significant upside on it. I'm not sure how important they'll be for Slay 2, but keep an eye out for situations where they could be beneficial.