You cant be the best at everything by playing a single color, because there are clear boundaries on the types of card designs each receives
It is therefore a good way to quickly build up a base of standard format cards which can then be used to move towards one or more decks
The format does not use bans, instead restricting problematic cards to one copy per deck
You don't necessarily want to be the player spending their cards and mana on a completely symmetrical effect, but Meletis's heroes give you just a pinch more of an advantage than what's bestowed upon your opponents
Each of these snazzy pieces of jewelry functions similarly to Lands, adding one mana of a single color to your pool at no cost - but while you can only play one Land per turn, you can slap down as many Moxes as you like
As long as it's a creature, you can do anything to it that you can do to a creature