With all of the recent malicious attacks and ransomware it may be a good time to block tor traffic and defend your networks.
Here ya go, I just decided to whip up a free blacklist in case anybody might find this useful, im just gunna leave it right here.
http://www.squidblacklist.org/downloads/sbl-tornodes.rsc
RouterOS IP Firewall Tor Node Blacklist import script: Updated daily.
Blacklist Name: SBL-Tornodes