Suspending a turn-one Tantalite's all well and good, but this mana rock's at its best in the same homes as any other suspend cards without a mana cost
It's also perfect for Eldrazi Unbound, but you'll get some cash for it if you decide to trade it away
It reads, Whenever Lord of the Void deals combat damage to a player, exile the top seven cards of that players library, then put a creature card from among them onto the battlefield under your control. While mill isnt likely to be your main strategy in a deck filled with Demons, the exiling is definitely nice
A common artifact subtype is Equipment
So how had I so poorly judged the potency of my deck
With Vampiric Tutor, Demonic Tutor and Idyllic Tutor also being in this deck, it's more than enough to find all the combo pieces you need