
(Edit: 12/1/19, Return to Dunwich).
This is quite good, despite the risks involved. Take 2!
Each scenario finished with this on the table basically nets you +2 XP for every scenario throughout a campaign. To maximize profits the current ideal path is probably:
Shrivelling -> Shrivelling -> Shrivelling X2, this takes 4 scenarios and costs only 2 total XP total.
Then: Ward of Protection -> Ward of Protection -> Ward of Protection also for just 2 XP total.
Finally Rite of Seeking -> Rite of Seeking -> Rite of Seeking for 0 XP total.
.
That nets you several incredibly powerful cards for just 6 XP, but it will take an entire 8 Scenario Campaign (With New Orleans. Cairo and Venice Thrown in) to make it all the way to this point, for the sake of sheer power in a deck as soon as possible you can choose to forego a few of these triggers to gain a stronger deck earlier, for example spending the 4 XP to finish up Shrivelling before scenario 3.
So, now that some of the most important tools in your deck will basically level themselves up for free, what to do with all the XP you earn?! This is the REAL fun of this card, now all the cool cards like Seal of the Elder Sign, Time Warp and Recharge can make MUCH earlier appearances!
So, when do you take this? On easier difficulties (Standard/Easy) I don't see no reason not to take this, but even so a few Investigators don't quite synergize with this card, Jim Culver for example is the most consistent dude in the game but he is also very very squishy, if you don't see the Jim's Trumpet very very early then you stand to suffer some unwelcome defeats at the hand of the very Shrivelling card's you took Arcane Research to upgrade. Grab Fearless asap to counter the extra horror.