I now think Snakebite is one of the best early common cards Silent can take.
Everybody memed this card to death when the game came out, but after playing a f*ck ton of StS2 I now think Snakebite is not just decent, but a very good early pick in various situations.
It's better than Deadly Poison in almost every situation, the card it gets compared to the most.
It pretty much doesn't even matter that it costs 2 mana because Retain allows you to always play this on the enemies' down turn. The upgrade is better than average, increasing poison by 3 is as much as Bouncing Flask, which is an Uncommon... and much more:
Since you can hold it in hand it removes itself from your draw if you want to.
It makes Calculated Gamble and Flechettes stronger, two really good Silent cards. It makes Storm of Steel and Bullet Time better. It uses Pounce really well. It can be discarded in those rare instances that you are forced to discard something and you don't really want to discard anything.
It has that awesome quality of being very good early and getting out of your way in the late game.
Pick Snakebite.