The Creatures
The Gitrog Monster can generate a lot of value by drawing cards and creating tokens with
Dunes of the Dead
and drawing two cards with any land that has Cycling. The additional landdrop the frog provides means double triggers on Tireless Tracker and maximum value with Ramunap Excavator which enables lands sacrificed to the frog or cycled to be replayed.
Outside of the synergistic creatures are other powerful creatures. Sylvan Advocate pumps both Hissing Quagmire and Hostile Desert, Rhonas the Indomitable's ability makes Gitrog and Gifted Aetherborn much more threatening and pushes damage through, and Thought-Knot Seer provides a powerful hand-hate effect that can be played easily with all the Deserts.
The Removal
The removal suite is fairly straightforward and utilizes the more common removal staples standard offers. Fatal Push's Revolt trigger is easy to get between Gitrog's sacrifice trigger, Tireless Tracker's Clue tokens, and the occasional sacrifice to
Ifnir Deadlands
. Grasp of Darkness and
Never//Return
provide additional solid removal.
Planeswalkers
Liliana, Death's Majesty is simply an additional threat. Her +1 generates a Zombie token but can also incidentally allow card draw when Gitrog is in play, her ability to reanimate for +0 is useful for the large threats of the deck, and her ultimate is gravy.
Lands
Manabase still has some kinks to work out, but the purpose of most of the lands is to synergize with Ramunap and Gitrog and generate value.