Blizzard has been bringing old card backs to the shop lately. We’ve already seen card backs such as Naxxramas, Cupcake and Magic of Dalaran. At this point it seems to be a common thing, so we should expect more old card back being available in the future.
Unlike last card back, which was originally a pre-order rewards, we’re back to the regular, seasonal card backs. We’re still in the theme of Old Gods, though. Clutch of Yogg-Saron card back was originally available as a monthly reward for winning 5 games during Season 25 (April 2016).
The card back is available for either 500 Gold or $2.99 / €2.99. It’s a limited time offer, we don’t know how long will it last, but given how long others were available for, we assume a couple of weeks at most. So if you want it, get it quickly.
Card back not really what I’m looking to buy with gold.
But if they start giving option to buy hero avatar with gold, (especially Sylvanas) I might consider to buy it. If card back has a price tag of 500 golds ($3), perhaps they could sell hero avatar for 1500 golds ($10)?
If Hero portraits were ever sold for gold, I imagine that they would cost 1500 or 2000, but knowing Blizzard it would probably be 2000 :p