Regenerator is an Infected card in the Deck Building Game's "Nightmare" pack.
They are especially dangerous Infected because of their effect, which lowers the damage output of all weapons the player's character uses by 10. This effectively negates the effects of cards like Deadly Aim and Desperate Escape. In addition, it makes many high damage strategies difficult to use. The Regenerator has 40 Health, and deals 30 damage if it's not defeated. It's worth 4 Decorations.