You don't lose unspent red mana as steps and phases end.
Magecraft ŃĘWhenever 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, Flame Dancer deals 2 damage to each opponent and each creature they control. If it's the third time, add RRRR.
Near Mint Foil - £3.40
Lightly Played Foil - £2.90
Moderately Played Foil - £2.40
Heavily Played Foil - £1.70
Damaged Foil - £1.00
Near Mint Foil Non English - £3.40
Lightly Played Foil Non English - £2.90
Moderately Played Foil Non English - £2.40
Heavily Played Foil Non English - £1.70
Damaged Foil Non English - £1.00