It\’s very simple. Play cards that gain you life, cost your opponent life, and build an army that is very hard to permanently remove. Outlive people with life and drain them with cards like Vengeful Bloodwitch, Funeral Room, High Society Hunter, etc. Gain life constantly with a slew of white cards. A few murders and bloodworms to help deal with opponents, and a few cards that will combo well with building a large army and or graveyard as well as with lifegain.