Abyssal Parasite

Bestow {b/g}
When Abyssal Parasite dies, target opponent loses X life equal to the number of Soul counters on Leeching Demon.
Enchant creature has, "Whenever this creature dies, target opponent loses 1 life, then put a Soul counter on Abyssal Parasite. You may attach Abyssal Parasite to another target creature you control."