This is a nice, simple common, but one that has some serious heritage behind it
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
Helitrooper wears Sword of the Animist well to get you the early ramp you need to power out bigger threats
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
In addition, Zombie Master gives all your Zombies the ability to regenerate
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