The mana base that's been suggested for this deck idea really doesn't take up more slots than it should in any deck...
35-38 lands
7-10 ramp spots (mana dorks, ramp spells, artifact/enchantment ramp, etc.)
7-10 card draw
3-5 mass removal
3-5 spot removal (mass & spot should include creature removal as well as artifact/enchantment/etc. depending on your meta)
30-35 cards that are the focus of the deck (including your commander)
These numbers will vary based on the deck and you can have cards that overlap between purposes,
Explore or
Growth Spiral, though somewhat situational, could technically count as both a ramp spot & a card draw spot, or in a life gain deck
Fumigate could kind of count as both a board wipe & a focus of the deck card. Cards with multiple modes are great as well for the flexibility,
Merciless Eviction for instance. Also with removal,
exile beats destroy as it's much easier to return something from a graveyard than it is from
exile (
Path to Exile beats
Murder, not just because of mana cost).
(Some of these may not be the best example but I'm working on 2 hours
sleep here as I was up basically all night playing between the LGS and a friends house)