WeakAura for the Tomb of Sargeras trinket "Tome of Unraveling Sanity".
Tracks the CD of the trinket. Shows up only if equipped and in combat.
Desaturated on CD, grows in size when less than 7 seconds left on CD.
Grows more and glows when off CD and plays a sound.
Configure the sound to fit your setup, as it currently uses a custom sound. Sound can be changed under the "Conditions" tab.
If there's any improvement or anything wrong with it, do tell.
GIF example can be found here:
Looks exactly like WA.