Phyrexian Oil Spring

When Phyrexian Oil Spring enters the battlefield, create a black enchantment token named
Phyrexian Infection with "{5}{b}{b}, {t}: Gain
control of all creatures that have oil counters on
them equal to or higher than their power. They
become Phyrexian in addition to their other
types."
{t}: Add {c}
{x}{x}, {t}: Put X oil counters on target creature.
You may only spend black mana to pay this cost.