Cats. All of them. All 18 of them at instant speed. And a 24/23 {Burnished Hart} with indestructible, shroud, trample, lifelink and vigilance. Not to mention two {Emeria, Sky Ruin}s to abuse my massive Elk. I won, if you can't tell.
Pics, it happened:
Part 1: Super Elk. (https://twitter.com/vileosufora/status/431329591039234048)
Part 2: Cats. (https://twitter.com/vileosufora/status/431329841304965120)