Eternal Thirst

永恒饥渴 (Eternal Thirst) (zhs)

Enchantment - Aura (CMC 2)
Enchant creature
Enchanted creature has lifelink and "Whenever a creature an opponent controls dies, put a +1/+1 counter on this creature." (Damage dealt by a creature with lifelink also causes its controller to gain that much life.)