Anti-Arcana Aiming (TTT-069 N) [Thoth of the Trinity]

[Quickcast] Play this card or its abilities only if you control a J/ruler with "Wu Xiaohu" in its name and with no attribute. You pay 1 less to play this card if you control a resonator named "Sara, AAA Awper". Destroy target resonator or addition your opponent controls with total cost X or less, where X is the number of magic stones your opponent controls minus the number of magic stones you control.