Over 4 of a single card used in Alchemy
I tried my best to see if it was legal in any way possible like the ***** cards but I’m pretty sure you’re only allowed to have four of the “3 blind mice”
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Rezzahan#77802 commented
You can have no more than four of any nonland card in your deck plus sideboard when the game begins. Once it begins, using card effects, you can exceed that by creating more copies in your hand/graveyard/library (via summoning in Alchemy). And nothing precludes having more than four of any permanent on the field, in this particular case via making a token copy of Three Blind Mice, and then copying that token with Three Blind Mice, which gives more TBM to copy the token with, etc. The first token copy was made by Dedicated Dollmaker.
In short, pay attention to what your opponent's cards do.