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Creatures that enter the battlefield and produce a lot of bodies are also valid

Commanders that have a powerful impact when they enter the battlefield or that immediately affect the battlefield somehow (by proliferating or giving your creatures some bonuses) are much more desirable than those that need to wait for your next untap step

The MTG Dual Lands are a cycle of 10 lands, all of which tap for two different colors of mana

(As an aside to that, do you have the discipline to dump the fun card to make sure you keep the Mana Rock?) If so, perhaps fewer (ramp spells, not Lands) are warranted

So, in order to enact the gameplan, we need to achieve two things: avoid removal, and avoid blockers