This is one of the most anticipated Magic sets in recent years, a direct-to-Modern (and by extension, formats such as Commander, Legacy, and Vintage) set in the Universes Beyond product line
The end result of this combo is basically a Bitterblossom, with the downside of making ground creatures rather than fliers but the upside of not costing any life and making 2/2s instead of 1/1s, along with an Inspired Charge thrown in for free every other turn
There's more things you can do to make Vishgraz scarier than Ixhel, such as double strike to dish out 8 poison counters per combat, Anointed Procession to double the amount of mites, blink to get more mites too,e tc
Storm is already a powerful strategy, and Prismari makes it even scarier by turning your instants and sorceries into Storm cards