This card has a variety of uses
While Memnarchs first ability may seem linear, its the second ability that really makes the Artifact Wizard shine
Err, you know what I mean
For decks with three or more colors, where you might only be able to afford a small number of MDFCs since you'll need most of your lands to either be basics (for ramping / tutoring purposes) or tap for multiple colors of mana, the best MDFCs are Bala Ged Recovery (seriously, if you have green mana in your deck, play this card), Valakut Awakening, Hagra Mauling, and Ondu Inversion, along with the mythic cycle, which is almost always good if you can afford another land that only taps for a single color of mana
Thrasios, Triton Hero, one of Magic's best merfolk, is a potentially powerful partner to give you access to the best landfall enablers and the best effects to pay you off for having so many Rocks
Its white and green colors make it perfect for the archetype, whether youre playing normal Commander or having this druid front your Pauper Commander deck