Forever Squirrels!

Land (22)
6 Forest
5 Island
5 Plains
2 Treva's Ruins
2 Riftstone Portal
2 Coastal Tower
Creatures(12)
4 Soul Warden
4 Auriok Champion
4 Drift of Phantasms
Instants (4)
4 Natural Affinity
Sorceries (8)
4 Lay of the Land
4 Life / Death
Enchantments (18)
2 Trade Routes
2 Elfhame Sanctuary
4 Sterling Grove
4 Intruder Alarm
4 Squirrel Nest
2 Aura Shards

The card Intruder Alarm inspired me to construct this deck. The infinite combo is a tad tough to get to. To pull it off, you need to have Intruder Alarm in play and at least 1 Squirrel Nest Enchanting one of your lands. Then, all you have to do it play either Natural Affinity or the Life half of the Life / Death card and bingo! Infinite Squirrels. If you have a Soul Warden or Auriok Champion in play when this happens, you get infinite life, too! The rest of the cards are for getting out the colors of mana you need (Lay of the Land, Elfhame Sanctuary) & getting to cards (Drift of Phantasms, Trade Routes, Sterling Grove) that make the combo. I threw in a few Aura Shards, too, just to have infinite enchantment/artifact destruction! Nothing in this deck costs more than 3 mana. This should help you get to the combo before you die, since there's not much in the way to stop people from killing you.