His -5 gives you an emblem that makes it so you can tap your Mountains to deal one damage to any target
The lack of removal protection is a drawback
Plot lets you pay ahead and cast later, Spree stacks modal effects , Saddle turns creatures into mounts, and Crime triggers whenever you target opponents or their permanents
I personally pick Dina, Soul Steeper as an excellent off-ramp and can win with Exquisite Blood and a land like Festering Gulch, but I'm sure you can get more creative with near-infinite draw and a near-infinite graveyard
This is also a strong 5/7 body for 6 mana, and there is nothing here to belabor
This has led to a number of players trying out Dimir Skeletons decks in MTG Standard, and so far theyre doing very well indeed