Tasha, Unholy Archmage seems to have a bug attached to her +1 ability which reads "Until your next turn, whenever a creature attacks you or Tasha, Unholy Archmage, put a -1/-1 counter on it."

I have observed that this effect stacks until a creature attacking either legal target triggers it and it can result in more than o e -1/-1 counter being placed on it. If the part that reads "until your next turn" is correct it shouldn't do this.

I had activated Tasha's +1 ability in a previous game and observed the icon to show the effect is active had a x2 on it when I used it two times without it triggering and to my surprise, it triggered twice instead of only once which I feel gave me an unfair advantage.

I'm just trying to do the right thing and report this in order to make the game more fair and balanced for all.