hello ,
is there a way to create a list of mac addresses and make some rules for them ?
I need to block some devices in Layer2 on a core and I don't want to create an specific rule for each MAC address in my network.
is it possible in mikrotik to list MAC addresses ?

There is no way to define MAC list in the RouterOS. It is already on users' wishlist.

There is no way to define MAC list in the RouterOS. It is already on users' wishlist.

Is there any sign to see it soon?

It is the question to Mikrotik's developers.