I went to a free tournament at my LGS, the theme was exhalted, all cards you play have exhalted and if they have it to begin with then double exhalted. It was crazy fun, next week is birds of paradise themed, any card can be used as a {birds of paradise} should be even crazier. What would be other good themes?
Any of the Vanguard cards or Planechase planes would be interesting. Maybe not ANY, buy many.
All creatures have deathtouch.
Whenever a non-token creature dies, it's controller put a number of 1/1 zombies onto the battlefield equal to that creature power (or toughness, or both).