Ashling, Flame Dancer (MH3 115)

Legendary Creature — Elemental Shaman • Mana cost: {2}{R}{R} • Modern Horizons 3 • Mythic

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, Ashling deals 2 damage to each opponent and each creature they control. If it's the third time, add {R}{R}{R}{R}.

Illustrated by Michal Ivan.