Clan Blood Witch

Whenever a vampire enters the battlefield under
your control, you may pay 2 life. If you do, add {b} to your mana pool.
{b}, pay 2 life: draw a card. Activate this ability
only when you could cast a sorcery.
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She'll steal your life drop by drop if she must.
But she'll take it gallon by gallon if you let her.