A much easier method:
1 Dauthi Marauder (Shadow 3/1)
1 Sunbond (Every point of health you gain gives +1/+1 to this creature)
1 Lifelink (Every point of damage it deals you gain in health)
Put those two enchantments on the Dauthi card. They probably won't be able to block it.
Turn 1: 3/1
Turn 2: 6/4
Turn 3: 12/10
Turn 4: 24/22
Turn 5: 48/46
This will go on forever. It's super fun.