Notes:

• It's a “Double-Multiaccess-matters” effect: thus, it needs repeatable double-multiaccess (e.g. WAKE Implant v2A-JRJ after two HQ successes, The Twinning after two turns of “Companion’ing”, etc), or multiple stackable continuous single-multiaccess (e.g Docklands Pass during a Jailbreak run, Nyashia during a Trick Shot run, etc).
• It's an “Any-Accesses-matter” effect: thus (IIUC), breaching a nonempty HQ with two upgrades installed in HQ's root still counts.
• It’s a power counter-based count-up (not a countdown): thus, it can be charge’d twice, but only first “self-charging” once.
• Being unique, you can't charge up two copies off of the same breach.
• Being a resource with a BoT-trigger, it's vulnerable to tagging.
• “3 Legworks worth” of breaches can be hard to pull off, but zapping “2.5 Hedge Funds worth” of credits can be hard to come back from! (The Corp does have a turn to spend as much as they can, once it has reached three power counters, but you don't have to sacrifice it if they do ‘invest’ all their credits into rezzes, under the Bird’s “threat of activation”; so “mass–Forged Activation Orders’ing” them seems good.)
• Being a virtual, it's “Gachapon'able” (and tutorable off Meeting of Minds, FWIW).

Synergies:

• Multiaccess: Mercury, WAKE Implant v2A-JRJ, The Twinning), Docklands Pass, Legwork, The Maker’s Eye, “Pretty” Mary da Silva, Nyashia, etc.

• (Resource-)Charging: Captain Padma Isbister, Stoneship Chart Room, Flux Capacitor, etc

Related:

• run-based econ-denial: Diversion of Funds, Hijacked Router, etc.

• access-scaling econ: Zahya Sadeghi, Psych Mike, etc.