Omnath, Primeval Manafestation

You don't lose unspent red and green mana as
steps and phases end.
Omnath gets +1/+0 for each unspent red mana
you have and +0/+1 for each unspent green
mana you have.
{r}{g}: Omnath gets +2/+0 or +0/+2 until end
of turn.