Here's the spell I create when I level up. Its costly yes but its effect is massive, unless you have me on the field of make discounted copies of this spell you better know when to play it or you'll lose tempo pretty quick.
Based off: Withering Wail
My quote when you use this and I'm on the field: "And here's the Velvet Room special people! Watch and weep!" (This is in reference to the Attendants of Power in the Persona games which when you fight them will use this to one hit quit you if you fail their rules.)