It could be something like:
- Casting shadow crash gives a 10 second buff where each VT cast will spread to nearby targets.
- Mind Blast causes VT on the target to spread to two other targets, or refresh the target with the least amount of time left.
- VT can detonate on a target like Seed of Corruption, infecting nearby targets.
- SC now has 2 charges and its CD is reduced for each mind blast.
We need something. Visions and M+ just continually remind me how antiquated VT is in a game where almost every other class just does instant, front loaded damage with no setup.