She can reduce the cost of one of the opponent's Characters by -4 and then KO it, an easy answer for pesky Characters and if you need to remove higher-cost Characters, you can back her up with a cost-reduction effect
Thats a nice bit of extra value, but its especially great if you combine it with a spell you cant normally cast due to it only having suspend or something
Combat Slivers: Might Sliver, Fury Sliver, Bladeback Sliver
If you have exiling removal such as Path to Exile, Swords to Plowshares, or Reality Shift, then you can also grow your Herder of Souls
Vault 13: Dweller's Journey
Big enchantments like Web of Life and Destiny let you cheat creatures straight onto the battlefield, while Spider-Verse breaks the usual Commander rules to let you have multiple Spider-Men on the table at once