The text on this card is super weird, but according to the Rules Reference, when you attempt a skill test, you have to draw a random chaos token and reveal it, which activates it's modifiers. So, basically, this card makes it so you don't auto fail or get a bad modifier that could cause you to fail a test.
Really good card that fits the Survivor's "last ditch effort" theme. It lets you have a pretty powerful turn and keep all your actions, so if your stats are high enough, you could automatically kill a monster or fully investigate an area. However, the "last ditch" part comes with the cost to play and the cost to even have.
At 3 experience points, it's very costly and is put up a lot of other handy cards. Then, once it's in your deck, you'll have to pay 4 resources. Even though most Survivor cards are cheap, that's still setting you back at least a turn (Emergency Cache and other such cards notwithstanding), so Will to Survive really has to pack a punch when it's played.
All in all, I love this card. It's fantastic when its used with your back up against a wall, and at worst, it's a safety net to ensure your tests will go smoothly.