Adaliah, Ashfall Arborist

Whenever a creature attacks you or a
planeswalker you control, that creature receives a
token Enchantment Aura with 'This creature
takes damage in the form of -1/-1 counters' and
'{2}: Sacrifice this Enchantment'.
Whenever a creature you don't control dies,
Adaliah deals 1 damage to an enchanted creature
you don't control and you gain 1 life.
"O bhas, saol!"