Vampire's Domain (DASA-EN009) - Dark Saviors Unlimited

Once per turn: You can pay 500 LP; during your Main Phase this turn, you can Normal Summon 1 "Vampire" monster, in addition to your Normal Summon/Set. (You can only gain this effect once per turn.) Each time your "Vampire" monster inflicts battle damage to your opponent: Gain the same amount of LP.