If your commander is something like Emry, Lurker of the Loch, you can pitch your hand to Lions Eye Diamond, take the three blue mana to cast Emry, and then on a later turn use her to recover the Lions Eye Diamond plus any other artifacts you pitched
The Gods ability to head back really works well in these formats and metagames, which is precisely the sort of metagame you typically see in multiplayer generally, and Commander specifically
Once you dilute that ratio, you might find yourself stuck without the mana you need or with the wrong half of your deck in your opening hand
Deck Themes The Hosts of Mordor focuses on the villains of the LOTR series, with goblins, orcs, and dragons, and all the named baddies like Grma, Saruman's Footman and Saruman, the White Hand