Ixo, the Inevitable

Deathtouch, ward {3}
{t}{p/u}{p/u}: Put a tax counter on Ixo, the Inevitable.
Counter target spell unless its controller pays
{x}{x} life where {x} is the number of tax counters
on Ixo, the Inevitable, you gain life equal to the
life paid this way by the spell's controller.
If a spell is countered this way, remove all tax counters on Ixo, the Inevitable. Otherwise,
double the number of tax counters on
Ixo, the Inevitable.