Let's take a look at the staple cards if you want to run a machinehead EDH list
Its another Enchanted card, and theres a good reason so many of them feature here: the rate at which Enchanted cards are found is 1 in every 72 packs, so theyre incredibly difficult to find
It being an artifact can also be useful in some decks as well, specifically in decks that have White or Blue untap effects and ways to recur it if something goes awry
Arrest (version #8) 2W Enchantment Aura Enchant creature or planeswalker Enchanted permanent can't attack or block, and its activated abilities can't be activated
Bojuka Bog, Mystic Sanctuary, and Ramunap Ruins, oh my
There's no main phase between your combat phases, so you'll have no opportunity to cast spells or activate abilities that could only be activated any time you could cast a sorcery