Embrace the Unknown is an altogether cool card, art and all, and Rumbleweed has a lot of potential in lands decks as a giant Overrun effect
First, the champion, playing Mono-Black Necro Control: Creatures (7) Lands (23) Spells (30) 4 Nevinyrral's Disk 1 Hymn to Tourach 4 Necropotence 1 Ivory Tower 4 Dark Ritual 4 Drain Life 3 Stupor 2 Mind Warp 3 Contagion 1 Serrated Arrows 2 Demonic Consultation 1 Zuran Orb Sideboard Then, in third place, representing the aggro decks of the format, Brian Hackers Bad Moon Necro: Creatures (19) Lands (21) Spells (20) And then finally carrying on the fine tradition of B/r Necro-decks, Chris Pikula, who actually increased the red presence in the deck with Incinerates and multiple maindeck Shatters (Winter Orb, Howling Mine, Serrated Arrows, even Black Vise, Ivory Tower, and Zuran Orb were worthy targets)
You can get a second copy of powerful triggered abilities like Archivist of Oghmas, or you can cash in on ETB effects from cards like Meteor Golem multiple times
Jund: With Jund, you have two main options: first, you can embrace the ramp theme, improve the finishers, and play a good-stuff / ramp deck