Hand your opponent something nice that they want on the condition that they do something for you in return
Unlike the other boosters from this list, you can get these for free at your LGS
Melding Mishra, Claimed by Gix into Mishra, Lost to Phyrexia isnt all that difficult if you want to build it into your strategy
Unlike Izzet, Spacecrafts actually have a better home in Dimir control, particularly if you pick up Susurian Dirgecraft, which comes with built-in removal
To me it seems that unless you're playing with lots of fetches and eldrazi, it just sucks a hissing iguanar's raging goblin
Summon: Primal Odin Speaking of win conditions, Summon: Primal Odin can be a black wincon as well