This is for the current deckbuilding/salvage/discards phase. So what is being transmuted from the round 3 matches. Hopefully this clears it up.
In that case...
THIS IS A BEYOND TERRIBLE EVENT CARD!!!!! It is completely and utterly unbalanced. Only teams that did well last round can use it.
If you want to kind of balance it out, use it for R4 salvage. Even then, I don't think it's a great EC, but it at least doesn't give an unfair advantage to teams before they ever play a game.
And yes, even if aether went 5-0 last round, I would still think this is a terrible EC.
It's not too late to modify the EC, please do so quickly.