Hasaltar, Wings of Paradise

Flying, Haste
Whenever Hasaltar, Wings of Paradise attacks, add {r}{g}, until end of turn, you don't lose this mana as steps and phases end.
Creatures you control have: "{t}: Add {r} or {g}."
{r/g}{r/g}: The next creature spell you cast enters the battlefield with a +1/+1 counter on it.