Was playing Standard and cast two spells on my turn- Goldspan Dragon and Roil Eruption. On my opponent's turn I saw a brief flash of daybound before it immediately switched back to nightbound, guaranteeing a win for the werewolf deck I was playing against. Not sure if using treasures as mana sources doesn't count as "casting spells" but it was annoying regardless.
Was playing Standard and cast two spells on my turn- Goldspan Dragon and Roil Eruption. On my opponent's turn I saw a brief flash of daybound before it immediately switched back to nightbound, guaranteeing a win for the werewolf deck I was playing against. Not sure if using treasures as mana sources doesn't count as "casting spells" but it was annoying regardless.