All you need is black and white mana and some early Vamps , 2 to 3 lands is all you need in the beginning of the game Legions Landing sometimes helps you to get the third mana source and Sorin makes sure you are able to get those Champion of Dusk onto the Battlefield to never run out of gas
If it's on the battlefield or in the command zone when you cast another Vampire spell but leaves that zone before the ability resolves, the ability won't do anything as it resolves
Anowon, the Ruin Thief Etrata, Deadly Fugitive Etrata, the Silencer Mirko Vosk, Mind Drinker Mirko, Obsessive Theorist Morbius the Living Vampire Runo Stromkirk Szadek, Lord of Secrets Tearle, Entropic Hunger
You still have two other opponents to worry about
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