Ok, so hear me out on this one: after the FAQ update, Zigil Miner no longer gives you resource equal to the cost you named (assuming, of course, that you discard a card costing that much when you use his ability) and instead gives you resource equal to the number of cards that match the named value. If you were playing a deck with a lot of high-cost cards (I had a fun Zigil Miner deck that was based around green 3-drops), the Zigil Miner is obviously much less powerful in decks based around his ability, but it's now possible to play the Zigil Miner in a deck with a lot of low-cost cards (0- and 1-drops) that would have been useless for the Zigil Miner before now. If I use Imladris Stargazer to reveal 2 0-drops and 3 1-drops from the top of my deck when I exhaust her, I can now rearrange the cards in such a way that the Zigil Miner gives me 2 resources when I activate his ability instead of just the 1 I would have gotten from him pre-errata, so the Zigil Miner actually works better in this type of deck than he did pre-errata.
I point this out not because I think that the Zigil Miner is a strictly better card overall now (he's much less powerful in decks built around him), but it seems like it might be easier now to slide him into some decks that wouldn't have benefited from him before and have him make a real impact. The errata on Zigil Miner is particularly interesting since the other two errata released simultaneously (for PoL and Beravor) made both cards strictly less powerful, and I would have expected something similar for Zigil Miner (especially given the phrasing used in the FFG article announcing the FAQ and errata).
Am I crazy here? Are there any other people who weren't so keen on including Zigil Miners in some of their decks but who are now changing their minds in light of the errata? Is the card actually more playable now than it was before?