Im not sure what Id build out of her besides a good-stuff deck in those four colors
One game, you might go wide by curving out and stealing threatening creatures with Captivating Vampire, while others you might grant your team flying with Vampire Nocturnus, and then use Sorin Markovs -3 to set an opponent to 10 life before ending them then and there
It is like a weak cross between Fire / Ice and Electrolyse
When you reveal this pay X and draw that many cards (and don't forget to gain that life too!) With the Realms above that'll be two more cards drawn
Examples of donate combos include: Harmless Offering + Demonic Pact Donate + Illusions of Grandeur Metamorphic Alteration + Archfiend of the Dross Fractured Identity + Phage the Untouchable Self-Mill / Demonic Consultation Wait, I thought you said you lost the game when you milled your entire library? Yes, I know this isnt called Alternate Loss Conditions. Just hear me out
The upside to this strategy is that every card does something on its own in the deck, making every card drawn extremely reliable