Some spells, such as the Snake Bite (Snake Magic), give you a chance of Poisoning a monster.
When a monster is Poisoned, it turns green. A Venom Vial icon and a turn counter appear in front of it. The counter shows how many times you can draw a card before the Poisoning effect ends.
Smaller monsters, such as Baby Ghost and Frog, are more susceptible to being Poisoned.

Other spells that may also give a chance to Poison a monster include:
- Green Pixie (Snake Magic)
Note: While Poisoning is still active, every card you draw deals extra damage to monsters that are Poisoned.
Learn more about: Challenge - Defeat X Poisoned monsters