The Stairs of Cirith Ungol

The Stairs of Cirith Ungol enters the battlefield
with half {x} exhaustion counters on it.
Whenever a creature attacks you its controller
may pay {x} where {x} is the number of
exhaustion counters on The Stairs of Cirith
Ungol. If they do they draw a card and lose 1 life.
Otherwise you may draw a card and lose 1 life.