Its potentially quite a bit of direct damage spread out across the board, and its still a 3/3 with first strike for 3 mana
In fact, the sheer power of a lot of this year's sets is kind of hard to wrap your head around
Were likely to have plenty of Forests and making those Snow-Covered Forests isnt very difficult
If it wasn't on the reserve list, I suspect it would have made it into Mirrodin block
Edric, Spymaster of Trest has a solid legacy in the format, making Mirror Mastery a solid deck overall
You will need at least one other Zombie in play to be able to cast Gravecrawler from the graveyard, but once you get going, you can keep sacrificing your spare Zombie token to keep looping death triggers for whatever outlet you need