Went 4-1-1 at my prerelease with a black/green deck. I was waffling on whether to run white, red, or green with black. Red had better high end threats, but white had white/black spells available and green had good low end threats and investigate. I tested using both red and green, and I found that green was better for the deck, and it turned out well. The matches tended to last for a while, but they didn't feel boring for whatever reason. It helped that I actually faced different kinds of decks--usually I will inexplicably encounter the same color combinations over and over.
Black cards:
1x Graf Rats - Creature - 1B
1x Olivia's Dragoon - Creature - 1B
1x Rancid Rats - Creature - 1B
1x Liliana, the Last Hope - Planeswalker - 1BB
1x Haunted Dead - Creature - 3B
1x Rise from the Grave - Sorcery - 4B
1x Midnight Scavengers - Creature - 4B
1x Certain Death - Sorcery - 5B
1x Distended Mindbender - Creature - 8 (Emerge 5BB)
Green cards:
2x Prey Upon - Sorcery - G
1x Gnarlwood Dryad - Creature - G
1x Hamlet Captain - Creature - 1G
1x Obsessive Skinner - Creature - 1G
1x Primal Druid - Creature - 1G
1x Quilled Wolf - Creature - 1G
1x Foul Emissary - Creature - 2G
1x Tireless Tracker - Creature - 2G
1x Swift Spinner - Creature - 3G
1x Tangleclaw Werewolf - Creature - 2GG
Artifacts:
1x Cultist's Staff - Equipment - 2
1x Thirsting Axe - Equipment - 3
8x Swamp
8x Forest
1x Foul Orchard
1x Westvale Abbey
Highlights:
* I was able to merge Graf Rats and Midnight Scavengers multiple times. Most of the time, my opponent multiblocked to destroy it.
* Midnight Scavengers on its own was better than I thought it would be. 3/3 really is a big leap from Gravedigger's 2/2.
* Liliana was really good, for weakening a creature, returning a creature, and fixing draws. I never used her ultimate.
* Awesome move of the day: I was out of time against an opponent and was on my last five turns. I was on my last turn out of those. I used Liliana to return Midnight Scavengers, cast it to return Graft Rats, and merged the two to boost the team and attack for lethal.
* I managed to flip Westvale Abbey and win with it.
* This is my first time playing with Tireless Tracker, and wow, it really is really good.
* Certain Death's life draining saved my life.
* Swift Spinner was surprisingly unhelpful.
* I never got to use emerge with Foul Emissary.
* Emerge costs really are cheaper than you'd think. I managed to get Distended Mindbender out pretty reliably, and though I mostly just got one card discarded, I got two once. I hardcast Distended Mindbender once.
* Quilled Wolf and Tangleclaw Werewolf were the MVPs.
* The equipment was super helpful, especially with my relative lack of removal. I did mess up with Thirsting Axe a couple of times, but other times, it was great, especially with the transformed Tangleclaw Werewolf, which must be blocked.
* My opponents' Weaver of Lightnings were annoying as hell. Not just because of the pinging, but because of the 4 toughness.
* One opponent pulled an awesome move. With Weaver of Lightning out, he used Collective Defiance to hit me in the face and discard his hand, and cast a madness card off of that, resulting in my board being cleared. He wasted this on weaker creatures, though, so I won that game.
* Somehow every opponent that was running white had Gisela.
* I got my ass kicked by a guy that managed to open all the spirits. And Gisela, as mentioned.