Since you're in mono black, permanents like Bontu's Monument and The Darkness Crystal make it even easier to cast spells, allowing you to hold mana up for interaction
Midrange strategies like Jund barely blinked at pitching extra cards, while opponents often struggled to recover
This Artifact Creature has Haste, which is always handy, and it also lets you proliferate whenever it becomes tapped
The Opening of the Core Chimil, the riven star, was free and known to the Komon Winaq now, but changed: the mother of the gods was wounded, glowing dimmer than before, and the Fomori ruins often dimmed the light further as they occluded her face
Hades, Sorcerer of Eld is just Yawgmoth's Will on a stick
Its a common and good card with a stellar ability that really puts your opponent on their heels