Of the enemy color combos, this is probably my least favorite, so I wanted to start with this countdown, and then move up, to my mind, to better colors
In my years of personal experience, examining good decklists, and talking to people much smarter than me, 50 mana sources is about the right number for most decks to shoot for, usually 37 lands and 13 ramp sources for a general budget deck
For example, the proliferate ability, which increases the number of counters on permanents, applies to loyalty counters
Illustrated by Jonathan Kuo Standard Not Legal Alchemy Not Legal Pioneer Legal Historic Legal Modern Legal Brawl Legal Legacy Legal Comp
Creature - Vampire Cleric Color tag templates(None) Nezahal, Primal Tide This spell can't be countered
It does hit your own cards and notably does not remove planeswalkers from play, but still extremely efficient for permanently exiling tons of cards