Glistening Sphere

Sfera Scintillante (Glistening Sphere) (it)

Artifact (CMC 3)
Glistening Sphere enters the battlefield tapped.
When Glistening Sphere enters the battlefield, proliferate.
: Add one mana of any color.
Corrupted -- : Add three mana of any one color. Activate only if an opponent has three or more poison counters.