In addition, Zombie Master gives all your Zombies the ability to regenerate
I get that they are similar cards, but that difference in what they hit is such a different kind of limitation than the two life
This ability can also be used at instant speed, so you can leave them to block during your opponent's combat phase, and tap them during their end step
Ideally youd like to pass this between yourself and another player, but I could see games where your opponents just play keep away with your commander for much of the game while drawing a bunch of extra cards, which seems like a pretty big downside that you could mitigate to some degree with cards like Homeward Path and Sword of Hearth and Home
These might go in the deck at a later point, but currently I dont think they are good enough
Why would I play one that made me discard when it died