Make blood-lands or a sanguinate ability for vampires to give other cards life-link/flying or Epidemic effects for DoT's
i think having blood-lands for vampire set with a certain royal-heirarchy to sanguinate and tap blood mana to give non vampires Mythic ones at cost of tapping and a turn but also Zombies carry various Epidemics that if they are blocked apply damage every turn to power and toughness unless players have blessed artifact fountains so you can even versatise other deck styles, i love creating my own style deck but Standard moves so fast and when i jump in and out of the game cards prices quickly drop or i gotta look for versions of Sorin that wont see play. Anyways im just saying there still can be alot to do with the game, maybe use some older cards just remaster them a bit, give it a thought.