The key thing to understand about Omega, Heartless Evolution is that its text regarding non-basic lands really means Towns, as thats what all of the non-basic lands in the set are
One of the most hype spoilers we've seen today is Vampiric Tutor
First, artifact density, because most of your creatures are artifacts, which feeds everything else
On the surface, Bello is yet another Gruul Commander who wants players to attack often and hit hard while they're doing it, but what sets Bello apart are the kinds of cards he guides players to assemble in their deck lists
Mila, Crafty Companion / Lukka, Wayward Bonder This is one of the more interesting MDFC designs just because its a planeswalker on one side
In the rare case where a legendary creature becomes a copy of another legendary creature with greater mana value (for example, if Sakashima the Impostor is a copy of a legendary creature with mana value 5 or greater), then when that creature dies, if it's still a legendary creature card in your graveyard, Havi's last ability will be able to target it