When playing Clench Virus from League of Assassins, you put a plague counter on a target character at the start of your attack step.
But, like other counters, do the plague counters get removed if the character is stunned? That would make it a much less useful card, in my eyes.

cosmic counters are the only counters that get removed when getting stunned. +1/+1 counters, repair counters, plauge counters, invisibility counters, etc stick around when getting stunned. now when a character gets removed from the game all their counters go away.

Aha! My friends are gonna catch hell for this. We've had to remove tons of +1/+1 counters due to his assumed knowledge! Thanks a lot.

Bear in mind, there are two cards that actually say "when this character is stunned, remove all 1/1 counters." They are Spiderman, Alien Symbiote and Sandman, Flint Marco. Both are from MSM and both are exceptions (because they explicitly state it on the card).

That's probably where your friend got the idea. Possibly also from the cosmic mechanic.

Don't let him live it down.