A modern multiplayer deck, this one might even work in singleplayer, but it really is better suited for a group of players.

This deck has a fair amount of mid game acceleration in Harrow. Where does this mana get pumped you ask? Why into Exsanguinate of course. But that's just one way to win the game, the other way is standard beat down and Damnation to clear the board (Many of the creatures in this deck are indestructible). Thornling is the beat stick in this deck, and you should have enough mana to go crazy with its' abilities. Bonehoard takes advantage of all the dead creatures and works best if put on Thornling.

The deck has a lot of deterrent built into it as well that helps protect you by making one an unappealing target. This is in the form or deathtouch from Typhoid Rats / Ambush Viper and Glissa, the Traitor. Along with the Predator Ooze / Royal Assassin combo. Plus don't forget Arena, which works well with all the critters with Deathtouch in this deck.

The side board has Grafdigger in case you need the graveyard hate (Never know in a multiplayer game). Naturalize for obvious reasons, Dismember in case someone else is player with indestructible critters and Spellskite to deal with control or burn. Two Gaea's Blessing complete the sideboard for protection from mill.