With
Perilous Forays you can just sac the Zombies to get a new land into play and loop.
Tectonic Reformation will be great in a deck with 44 lands AND graveyard recursion with
World Shaper,
Splendid Reclamation and
Crucible of Worlds. If you manage to pick up a
Wrenn and Six would be a nice addition. The
Mending of Dominaria also fits into this plan,
Living Twister gives you some versatility with direct damage.
You could look at
Valakut, the Molten Pinnacle as well. Harder to turn on but you can still organize a land base to get the threshold for both
Field of the Dead and Valakut with enough lands in play.
You want some pay off cards for getting 2/2 Zombies as they are not that threatening.
For draw there is;
Collective Unconscious,
Shamanic Revelation,
Skullmulcher,
Slate of Ancestry,
For mana there is;
Earthcraft,
Song of Freyalise,
Cryptolith Rite.
There is a possibility that
Thawing Glaciers is good.