I'll never talk about Lands in the main part of the article, but some artifacts are fun enough for me to talk about in terms of a monster design
Not only does this help you get around Ruby/Amethysts huge weakness to discard decks, it also lets you get away with running less copies of Be Prepared and Dragon Fire without hurting your strategy
Nekusar, the Mindrazer Nekusar, the Mindrazer is a classic Grixis commander, offering you a win condition when you cast wheels effects
You can patiently sift through your deck until something powerful is on top, and then pay 1 mana to scry 2, effectively allowing you to cast the top card for free
But there's one notable exception: FIN will introduce a new type of land, Ciudad (Spanish for City)
Also, it's colourless, so it can slot right into any deck