Much as these dual manlands are flavourfull I suspect the cube would be far better served with a smaller cycle of five mono coloured manlands that did a better job of producing coloured mana
The majority of the time, you will be generating five power for four mana which is on par with Polukranos, World Eater as well as many other solid four-mana threats
Colorless cards also play a big role in the deck, with devoid thrown in as a slight twist on the theme
If Compy Swarm leaves the battlefield before its triggered ability resolves, the token will still enter the battlefield as a copy of Compy Swarm, using Compy Swarm's copiable values from when it was last on the battlefield
Plus, you can put land cards into play when it attacks
Okay, that out of the way