The main strategy/win con is to mill Bruna and hopefully an Eldrazi Conscription into your graveyard (typically via Gifts Ungiven), then cast Bruna with Unburial Rites (or Sheoldred), then start swinging for massive hits. But if that doesn't happen, the deck can do some other fun stuff. Lots of removal spells, and if you can clear your opponent's creatures off the battlefield, there's plenty of muscle even if Bruna doesn't factor in.
Hyena Umbra is the cheap aura of choice for Bruna or other creatures, first because it helps a creature survive a Wrath of God, second because it makes Stinkweed Imp a pretty mean blocker. Especially fun to cast Wrath with the Hyena on Bruna, she loses Hyena, then Hyena reattaches when she attacks.
Sheoldred works really nicely in this deck.
Havengul Lich + Shriekmaw = removal machine.
Cards that were tough choices:
Thought about dream twist or Tome Scour instead of Thought Scour; ultimately stuck with Thought Scour because there's not much else in terms of card draw mechanics. Forbidden Alchemy would be ideal if not for the mana cost, need those mana's for the mid-game.
Stinkweed Imp could have been Mindshrieker or Vampire Nighthawk, and it's still a tough choice. Nighthawk's a great alternate target for the auras and the life gain can be handy, and Mindshrieker can get really huge if you mill some of the high mana-cost cards...however, Mindshrieker also tends to be a waste of mana in the mid-game when you're trying to cast other things, and I took Stinkweed over Nighthawk for the dredge mechanic (handy after a Wrath of God).
You probably think a 70 card Modern deck is dumb. I don't care. And maybe it'll buy me an extra turn or two against a mill deck. (Just kidding, this deck would get eaten for lunch by a good Modern mill deck. Or most other Modern decks, probably. Give me a break, I'm new to this)
The sideboard:
Just tried to put in useful counters to various opponents' strategies that could be problematic (dispel for countermagic, disenchant for graveyard-exilers, negate for all sorts of things, silence because it's mean and fun). The deck as constructed sort of assumes a creature-heavy opponent, but I think it has some good sideboardable options against other things.
Liliana and Snapcaster Mage are in the sideboard just to acknowledge that this deck is screaming for them, but, at the $, they'll have to wait. This isn't quite a budget deck, but I'm still pretty cheap.
Thoughts always welcome, my first real attempt at making a modern deck. Would love suggestions for anything that won't break my bank too much.