I think false curse has the potential to be a turn 2 kill, but you might be holding gain life cards you dont want to waste..
I was trying to figure out a deck like this..
I think it would be best accomplished 1 of 2 ways..
1, you have a lucky hand... play a swamp T1,
Turn 2 play a forest, T3 kill
or... splash Green with white and use some of the best life gain spells.. btw white spellbomb gives 5 life..
Possibly use reclaim or some re-cur.. Pop a spellbomb for 5 life, reclaim.. pop another.. false cure... game..
I think another thing you could do is set up alliances.. especially in a group game.. then kill someone in an instant..
It would play like a life gain deck... until you found your free life gain cards and a false cure.. then youd kill em...
or if you need to stay alive in a group game.. play politically with some black cards to kill off and punish people for messing with you... like ragged veins..
Cursed flesh may not be instant, but it can kill disciples, and make a creature unblockable... talk your opponent into hitting an enemy while you help him..
You could ride along by spirit linking an alliances creature..
maybe im combining 2 separate deck ideas..
maybe just G/W i dunno...
or run demonic and vampiric tutors,diabloic is bleh..
also with the green.. all you really need is 1 forest... so GWB is pretty much WB with some land thats a little off
Natural Spring 3GG Sorcery Target player gains 8 life.
Heroes Reunion GW Target player gains 7 life.
Awe Strike
Soothing Balm 1W Instant 5 life
Spirit Link
Congregate 3W instant 2 life for each creature in play
Ragged Veins - 1B
Enchant Creature
You may play Ragged Veins whenever you could play an instant. Whenever enchanted creature is dealt damage, its controller loses that much life.
139/306
Common
Contaminated Bond 1B when attacks or blocks.. loses 3 life
4 Ragged Veins
Insubordination
2 Crown of Suspicion
Traveling Plague 3BB gets -1-1 each upkeep
Lingering Death 1B sac this creature at end of turn.
4 Cursed Flesh B -1-1 and cant be blocked
Death Watch B owner loses life equal to its power
Rejuvenate
3G, Sorcery, Urza?s Saga Common
Cycling 2 You gain 6 life.