Survival Guide

Survival Guide heals you for +3 BEFORE each combat. It is useful in many different situations, mainly because it heals you before the combat. This spell can stop the debuff from Cursed Hourglass. (If you have the Cursed Hourglass spell that means you will take 3 damage at the START of the fight, and the Survival Guide will heal you, stopping it). 
Survival guide is marked as green, same color as Medical Kit and they do stack. It may appear that this spell is similar to the Band-Aid, except it can only cure in boss battles, but this heals you in whatever fight it is (no matter robot (weak), skull (strong) or boss). 
(If you have to choice between Survival Guide or Medical Kit, Survival Guide is better since you will have more health fighting, rather than after it)
The Survival Guide as depicted in the image:
Survival Guide
Category:Spells
Category:Healing Spells
Category:Rare
Category:Buff Spells
Category:Cards