Fort Despair

Whenever you exile a card put a number of soul counters on Fort Despair equal to its mana value
{t}remove five soul counters, you gain 3 life
{t}{1}remove ten soul counters, draw 2 card
{t}{2}remove fifteen soul counters, create a 1/1
black Dullahan creature token with ''whenever a creature is put into exile put +1/+1 counter on
this creature (activate only once per turn)''