While it costs a lot, it can be absolutely worth it
A great example of this is the fan-created and fan-run format Gladiator
Some opponents can recover from that better than others, but its a better sweeper than focusing on islands or snow
Ghoulcaller Gisa turns any big creature into a zombie horde, and you have plenty of big, big creatures, even without meaningful sacrifice or zombie synergies
This deck is the shell of any Tron deck (Green, Red Green, Black, Red Black, and Green Black)
The rest of the deck is fully on theme, as even a good amount of the removal in the deck creates a zombie in one way or another (Enter the God-Eternals, Syphon Flesh, Cruel Revival)