What is there, really to say about this card? This isn't like Jackson Howard, where a new player can look at him, scratch their heads and move on, with no understanding. Anyone who has played a game of Netrunner will instantly see the power of this card.
Netrunner, as a game, conceptually (enormously simplified): The corp earns money through assets and operations and spends that money rezzing ice (once) and advancing agendas. The runner earns money through resources and events and spends that money trashing assets, breaking ice (over and over) and installing new things.
Resources help the runner more than assets help the corp because the runner can access and trash the assets while the Corp can do nothing about the resources unless the runner is tagged. Data Folding and Underworld Contact will generally provide their income all game, while PAD Campaign is frequently trashed. This is balanced by the fact that the Corp only has to rez its assets once, while the runner must break them over and over.
If the Corp manages a tag, they can start burning resources, however this process is laborious, at one click and 2 creds per resource, preventable by Fall Guy Expensive with Wireless Net Pavilion, and as soon as the Runner gets a turn they can remove the tags and get their resources safety back.
Not anymore. With this card, the world has changed. Runners lose every one of their resources for 1 click and 1 card, cards that took them a click and however many creds each are instantly gone. 1 click, 1 cred, and you kill potentially a third of the runner's deck. Mostly, you kill their entire passive economy. Back to clicking for creds for them.
What this means is that the runner can't really afford to get tagged anymore. It used to be that you could put up a Plascrete Carapace clear them as soon as possible and you'd be alright. Closed Accounts hurt, but you still had whatever gave you those creds. Wyldcakes was still running, your engine still in place even if the gas was suddenly gone.
There was already a movement away from plascrete and towards NACH (New Angeles City Hall ). This pretty much forces the switch. This card is 1 influence, no reason it can't be everywhere. Get tagged, lose a third of your installed cards. Womp Womp.
As for the Tagme plan? Well... that isn't as affected. If you are floating tags anyway you aren't relying on your resources. Who cares if they more efficiently trash them if you don't rely on them in the first place? Closed Accounts remains the main threat to that archetype.
One thing that is card is a silver bullet to is the Fall Guy, Pavilion, Data Leak Reversal flavor of decks, but I can't imagine anyone will mourn a blow to no-run netrunner (wait, save it by running Valencia Estevez: The Angel of Cayambe ). Good riddance.