I had Call for some time in an earlier iteration, but it never came up when I could use it, and since I started putting in non-Zombies, I forgot about it. However, given that I have ways to make things zombies that aren't...I might consider getting it back in at some point.
If it is in your price range, The Scarab God goes excellent with zombie decks. So well in fact I'm making a zombie deck with it as the commander.
Desperately hoping I can trade for it before I plunk down cash, but that's definitely on my radar, especially after playing against it several times(why yes, I do love wasting a board wipe every other turn!)