Providence, Profaned Goddess

You don't lose unspent red mana as steps and phases end.

Magecraft — Whenever you cast or copy an instant or sorcery spell, discard a card, then draw a card. If this is the second time this ability has resolved this turn, Providence, Profaned Goddess deals 2 damage to each opponent and each creature they control. If it's the third time, add
{r}{r}{r}{r}.