Amaryn, Voice of Purity

You can't get poison counters.
If another creature you control would have -1/-1 counters placed on them, put that many +1/+1 counters on them instead.
{g},{t}: Add any combination of colors that can be produced by lands you control to your mana pool
equal to the number of creatures you control with counters on them. This mana doesn't empty from
your mana pool as phases end.