Amera, Wasteland Rebel

Lands you control that produce {c} have
"{1},{t}: Add one tainted mana of any color."
(Tainted mana can be used to pay for {c} costs as well
as any other costs it would normally be able to pay.)
{w}{u}{b}{r}{g},{t}: Put X +1/+1 counters on target creature, where X is the amount of {c} in that
creature's mana cost plus the amount of tainted
mana spent to activate this ability.