Infernal Intern (Kingdom Aflame, Standard Card, #3) is a common Undead NPC card with 5 attack and 0 defense.
Card Effect
Infernal Intern has a +50% chance to critical strike for each dark card in your hand.
Card Description
Many find the opportunity to sell one's soul in exchange for power too tempting to resist, but the undead can rarely find a buyer since it's so much harder to extract the spirit from their corporeal form.
Only the most desperate or low-ranking demons are willing to purchase these souls, which means their favors aren't always reliable.