Poisoned is a rules term introduced in Mirrodin Besieged. A player is poisoned if they have any poison counters. It doesn't matter how many poison counters the player has. Some creatures become stronger if the opponent is poisoned.
- Having one or more poison counters. See rule 122, “Counters.”
Creatures that benefit from opponents being "poisoned"
- Chained Throatseeker
- Mycosynth Fiend
- Phyrexian Swarmlord
- Septic Rats
- Viridian Betrayers
- Whispering Specter