This card is a lot more dangerous than it looks. Should you be trying to reach Dim Carcosa via the Vortex, ie, leave through the Abbey Tower, then you could be in a bind.

Once you advance the "c" agenda to part 3, it will become an Act, and you will be unable to put any Doom on it. Furthermore, you will need to get this card out of your hand to investigate the Abbey Tower, which you cannot do via the Tower's ability or anything else that requires a choice of card discard. If you draw it at this point, you will be locked, unable to complete the scenario until you find a way to get rid of it.

Your only options at this point are to draw and fail either Twisted to His Will or Worlds Merge (the latter requiring you also to have 3 or fewer cards in hand). With the waters of the "a" agenda rising, this is quite possibly a campaign-ending situation, especially on Solo where you have no partner to finish off the Abbey Tower.

If you are playing on Solo - you must plan for this card, either with cancellation, or waiting to draw it before finishing off the "c" agenda. On multiplayer, you must also be aware that once the "c" agenda is finished, anyone drawing this (probably) won't be able to help win.

[NB: as an aside, the "a" agenda equivalent, Hastur's Grasp causes no such issue with it's Chapel of St. Aubert, which makes me think that this interaction was not intended, and this card is accidental in it's potential to lock you out].