This is theorycrafting. A review from somebody with experience running this card will provide better insight.
The first names that popped into my head while reading this card were Minh Thi Phan and Silas Marsh. It enhances what they want to do normally. I don't know what else is competing for relic slots for them (Cherished Keepsake? possibility to add Key of Ys later?), but this seems really strong for them. An auto-include unless I'm missing something. The typical Dark House "Ashcan" Pete deck would benefit greatly from it.
Otherwise, it just depends on a) how many skill cards are you running (I know it works on any card, but a skill card is the ideal option), and b) what relic cards you are running. Like most assets, it gains value the earlier you play it. Maybe that's good enough to test it with Dr. Elli Horowitz and run a lot of skill cards. Seekers in general have access to good skill cards. It also works nicely with wild skill icons. On the Survivor side, Dark Horse decks can utilize it.
The biggest weakness of this card is the one-time use limitation. You're only getting one extra icon per turn (I'd imagine this makes it worse on harder difficulties, I only play standard). You also have to have a card to commit that has the correct icons on it. You can limit that weakness through deckbuilding. One extra icon seems weak, but you are already adding icons with the card you are committing.
It's hard to say if this is a deck-defining card like Dark Horse (outside of Minh and Silas), but it should be a decent amount of help if you're going to run lots of skill cards anyway (and/or cards with good skill icons).