One of the "take a bunch of damage and.or horror" signature weaknesses. Looking at the two elements, the effect and the discard condition, we get:

The effect: You take 0-4 horror, which is unlikely to kill Mark, but it can lose a scenario or campaign and getting Mental Trauma just increases the deadliness of the card. Fortunately for Mark, Guardians have gotten better healing options since Carcosa, and tools like Hallowed Mirror, Second Wind, and even Thermos can help keep Mark's damage low, and there are plenty of Guardian Allies with 2-3 Horror soak to keep Mark on an even keel. If you don't go wild with Sophie before this Weakness drops, Mark will probably be OK. Good thing it doesn't say "direct horror." As a side note, something in the wording of the card rubs me the wrong way, but its meaning is clear.

The discard condition: You draw it, it's Revelation effect happens, you discard it. Simple, but it can happen multiple times, if you deck yourself.

All in all, this is a below average signature weakness. It can ruin your day at the wrong moment, but if you build and play with it in mind, it is unlikely to have a severe impact.

This is a fairly unique signature Weakness, annoying but persistent. Looking at the two elements, the effect and the discard condition, we get:

The effect: fairly simple -- if you succeed, return the token and draw another. This has the unfortunate result that you slow down the game a bit drawing tokens and then redoing the test, keeping track of possible stacking token effects. On Hard/Expert, this can give you lots of extra chances to trigger bad token effects, but it's more manageable in Easy/Standard where the annoyance of going back to the token bag repeatedly is maybe greater than the actual mechanical effect.

The discard condition: Fail a test. However, that just puts it back in your deck. Given Seeker card draw, it's not unlikely you will see this over and over.

All in all, this is an average signature weakness, maybe above average on harder difficulties. it can end scenarios by piling on Doom, Horror, or Damage in worst case scenarios.

If you follow the reading on Abandoned Mine or The Lonely Tree, it is two icons + draw on your first and third actions this turn, an icon and a draw on the second action and two icons during the mythos and other phases.

Good card.

Good card for Nathaniel Cho. This card will be played during the Enemy Phase, so he can deal 2 damage instead of 1 even if he used his ability during the investigator phase. You possibly save someone in trouble, soak the attack (or Dodge it), then deal 2 damage to the enemy to kill it or soften it. Can be followed by a Counterpunch. This card has the Spirit keyword so can be fetched with the Boxing Gloves.

I'm not usually too big on horror healing cards, but this is actually quite strong on Carolyn Fern. Since you can split the horror between multiple investigators, they each get 1 resource. Heal your friendly Mark Harrigan or Roland Banks who are very prone to go insane, but also need the resource. Another option would be to run this with Carolyn Fern in a group with Agnes Baker, who can then go ham with self-inflicting horror cards like Meat Cleaver, Forbidden Knowledge or Painkillers.