Normally, I'd would entertain the idea of having a chance to not exile a card, especially if it's determined by a moderate difficulty test of a skill that many investigators in this class excel in, and also gain a 1 resource discount for 1 additional XP.

But the very same pack that introduces this card also contains a card that lets you return its cheaper variant back to your deck for FREE in between scenarios. Both copies, potentially. Understandably, you might not have Unspeakable Oath, or maybe, you really don't want to chance exiling your Test of Will. This pack gives you an even CHEAPER alternative with the exact same effect. The only thing that this card affords you over its Lvl 0 version is that the effect is guaranteed to happen in Lvl 2, but then you have to pass the exact same test in order to keep it from being exiled. If you weren't confident enough in passing that test to settle for the Lvl. 0 version, what makes you think that you can salvage the Lvl 2? In that case, you're just flushing an extra XP down the drain; I'd rather take my chances on the Lvl 0.

The biggest benefit this card is supposed to give you is saving your XP from having to dump it into upkeeping its exiles, and you know what, if you just bought 1 copy for the fun of it and wanted to see how far you could get without losing it, then sure, this card obviously has more sustainability over time than Lvl 1. But if you're including this in an exile deck or planning on buying 2 of these, just use Lvl 0 for lower difficulties and Lvl 1 + Deja Vu for higher difficulties. This card really has no place in your deck given the alternatives. If you don't have Unbreakable Oath, just pretend these cards are Lvl 1 problem solved :)

A Test of Will is a card that makes you make... A Test of Will. In playtesting this joke gets a laugh maybe a quarter of the time, but it may be campaign dependent.

Stella is the most obvious candidate but I believe this is also very strong in Patrice Hathaway for a couple reasons. For one, the fact that this card has a Level 0, Level 1, and Level 2 variant means that you can upgrade twice through Down the Rabbit Hole if you split the upgrades between two different scenarios. Secondly, one of the struggles of playing Patrice is drawing situational cards during the wrong round, so sometimes you draw Ward of Protection or Deny Existence and there's nothing to hit. Including multiple counters is a good way to make sure you have a counter available when the time comes.

Overall, risking Exile is a scenario dependent cost. If you counter an Ancient Evils in a four player game with this and lose 2 XP, this really isn't the worst trade - you effectively paid 2 XP for 12 additional actions.