Tear in Time

 

Danigral - 3 out of 5. This is vastly superior to the MU one simply because this won’t give your opponent cards and it draws 2 cards off 1 struggle. It can also recur a key control card. This can give you a lot of momentum going into mid to late game.

 

mnBroncos - 4 out of 5. Just like MU story attachment but better with only having to win one struggle, and your opponent can’t get benefit. (also taking card from discard pile can be relevant).

 

Obtuse - 3 out of 5. Conditional (but one you’re probably meeting easily in Yog decks), and the fact that it’s a response instead of a forced response means you’ll in most cases be getting only one, perhaps two uses out of it. Strong, but I’m not quite sure it’s a total slam dunk.

 

livingend - 4 out of 5. It’s not difficult to figure out which mode of Tear in Time is going to be chosen in the vast majority of cases. Given the low conditionality of the response, I could even see this replacing Vortex of Time in a good chunk of decks. The difference between a one-cost and a two-cost card is immense during the initial stage of the game and being able to maybe even get more than one trigger out of this is a considerable upside. Verdict: Might be the new auto-include card engine for Yog, especially considering that the faction this box tries to promote isn’t exactly notorious for its prowess in arcane struggles.

 

WWDrakey & Ire - 3 out of 5. Clearly one of the best Story attachments we’re getting. Having recently played a Twilight Gate deck for our SC, I can attest to the power of combining it with anything that helps either draw into it, or repeat it. This card, does both. On top of that, unlike the Miskatonic attachment, this is nicely one-sided, and Yog isn’t particularly swimming in straight-up, honest-to-Yog draw-engines. 

You can trigger this only once, even if you have won more than 1 arcane struggles?

Each Arcane struggle you win will allow the response to be triggered, as it doesn't say "one or more Arcane struggles" to act as a fixed limit, nor a limit of "once per turn".
 
As such, you would be able to trigger it for each Arcane you win at a story.
 
It was used in a deck which adds multiple Arcane struggles in this deck - http://www.cardgamed...e-membrane-r106, which was recorded in http://www.cardgamedb.com/forums/index.php?/blog/145/entry-519-decked-11-arcane-in-the-membrane-vs-rituals-of-the-silver-sothoth/.