You might think these next few cards are overkill, but I've played enough decks that left me empty-handed in the mid-game to last me a lifetime
(Leads to: Sandfall Cell) Sandfall Cell - Each player loses 2 life unless they sacrifice a creature, artifact, or land of their choice
Its cheap, its effective, and both Dimir and Orzhov decks wont be bothered by the life swing too much
The secondary clause of his text acts as a massive mid-game engine, automatically granting the Leader an additional plus 2000 power buff as long as the player has nine or fewer total DON
PST (Pacific Standard Time) , so pull out your best electric deck and get battling
Fortunately, there are a few ways to go about abusing Sin, Spiras Punishment