Arylhna, Occult Pyromancer

The first instant or sorcery spell that deals
noncombat damage with mana value 2 or less you
cast from your hand during each of your turns
costs life instead of mana.
{t}: Choose target creature or planeswalker an
opponent controls. Until end of turn, it gains
''Whenever this permanent is dealt noncombat
damage, you lose 3 life.''