Styxio, Servant of Malady

Defender
At the beginning of your upkeep, put a -1/-1
counter on Styxio, Servant of Malady.
{2}{g}, Remove three -1/-1 counters from Styxio, Servant of Malady: Until end of turn, whenever
you tap a land for mana, add one mana of any
type that land produced.