Carpathia, Home of the Roost

{t}, Pay 1 life: Add {b} or {r}.
Whenever a Vampire enters the battlefield under your control, if you spent mana produced by Carpathia, Home of the Roost to cast it, that Vampire gains haste until end of turn.
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Its residents do not wear silken robes, do not sip blood out of chalices. They wear nothing but the skin on their back, and guzzle blood from open wounds.