Its not a bug, three blind mice makes a copy of a token. If itself is a token, you can create a copy of it. Reading the card explains the card.

Playing ****, he currently has 180 blind mice attacking me using this glitch.

He used Dedeicated Dollmaker to turn the Three Blind Mice card into an artifact, which made it generate about 180 tokens and 50 copies of the card.

Can anyone tell me if this is this a glitch or valid game play?

This is lame and it's crazy it hasn't been addressed. I simply quit matches once it's replicated. Your matching also makes it worse. Things like this are why I don't play for anything of value.

Unfortunately its not a bug. It happened to me as well and I at first thought it was a bug, but it wasn't. To everyone of us we all did miss one thing. The saga does not copy itself. But... There are other cards that can create a copy of the saga, that is a token. So for example Calix, Guided by Fate or Mythos of Illuna or Tamiyo, Compleated Sage have the ability to create a copy of the Three blind mices that is a token. From there on you can make copies of the token saga exponentially. So... You just need to kill, destroy or neutralize the card, that creates a token-copy of the Three blind mices and therefore prevent the player to create a token-copy of the Three Blind Mices. More on this heere: https://www.mtggoldfish.com/articles/my-copies-copy-my-copies-brewer-s-kitchen

It is neither a bug nor a glitch. It is an extremely well-known combo that uses Three Blind Mice and Yenna, Redtooth Regent.

This is boring, destroys the fun in the game. And is a bug, because a saga is not a token. So this card needs to be fixed or banned

Some players are using a very unfair glitch to execute a strategy with the card "Three Blind Mice" were the card duplicate itself on and on. This generates a huge quantity of the enchantment and a huge amount of mice in the battlefield. You need to address this problem because it makes impossible to win the match, and blows all the fun from the game. In my opinion it's a glitch or bug, beacuse the enchantment says "duplicate a token", but the enchamtment itself is not a token. Alternatively you could banish this card in ranked matches, because its not fun at all, makes the match very boring and frustrating.

So, is this a bug? Or is it just a broken card that desperately needs to be nerfed? Because this post is over 6 months old and I just got slammed by 2 TBM decks in a row

I have had multiple games in high diamond lobbies to where this exploit was used. I stopped playing ranked for that reason. Until this issue is handled I will not be playing ranked and forfeit any matches with this card in an opponents deck.

same here

Three Blind Mice: infinite replication bug
Player made infinite copies of the card

Same bug, needed to be fix

ditto to earlier comments.

Yes, Sagas are not tokens. Unless someone made a copy, like with Yenna, Redtooth Regent. Then TBM can target the token copies of itself to make more.

Sagas are NOT tokens, and as such are not valid targets for the "copy token" language of the card.

The infinite recursion bug makes this an automatic "I win" card for anyone not playing white or green, who doesn't have a "disenchant" in hand or draw one on the next turn after TBM comes into play.

Please fix this bug YESTERDAY, since you should never have allowed this to slip through. Remember play-testing? What a neat concept that was, WotC should go back to using it!..