Ciggaq, Kings of The Sewer

When Ciggaq enters the battlefield, target
creature you don't control gets -2/-2.
{1}{b}{b}, {t}: Target creature you control becomes
a 4/4 black Rat creature token with menace.
Overload {5}{b}{b}{g} (You may cast this spell for its
overload cost. If you do, change its text by replacing
all instances of 'target' with 'each'.)