If the manabase allows, Dimir can benefit greatly by dipping into Orzhovs toolbox for some additional stabilization and removal, although it already has access to a formidable suite of removal tools
Note: While I never delved too far into the Final Fantasy video games, I did play FF8 when it released (that opening cinematic blew my mind as a lad), and I nearly beat FFX , but was derailed by a crippling BlitzballBlitzball addiction even without the Jecht shot
Tyrranax Rex Cards that want to get in for damage are pretty good targets for trample, which is why Tyrranax Rex and its toxic ability are a match made in heaven
Five Goblins out
If you're curious about the tribe, I trumpeted about it in my Budget Elephant Tribal article, which has a trunkload of ideas that you can assemble for peanuts if you take out Elephant Graveyard (thank you, Reserved List)
Speaking of mana rocks, one that makes your tribe better is okay by me