It's Bookmark from Android: Netrunner.

While Aamir Khan provides draw value and long-term hand planning, Bruno, like Bookmark before it, is a "build-your-own-Emergency-Button."

And he's not limited to reactive usage either - say you pull both Embiggen! and Shrink early, and don't have the resources to pay for both. Bruno'll hold that for ya.

A lot of villains like to knock cards out of your hand, so he's also an insurance policy. Behind Aamir Khan he's definitely a card you want to see in your opener.

A very important thing to notice is that you can store an unlimited amount of cards under him, but take only 3 at once. If you flip every turn, you can filter your deck very precisely and take the filtered card exactly when you need them!