Ayolin, Child of Eleon

Menace, rampage 3
Whenever Ayolin, Child of Eleon deals combat
damage to a player, put a +1/+1 counter on her.
{w/b}{w/b}{w/b}, Remove a +1/+1 counter from Ayolin,
Pay any amount of life: Exile target creature with
toughness X or less , where X is the life paid to
activate this ability.