That nine mana is used to play the namesake card, Dragonstorm
Krenko is the best source of disposable tokens and is often played as a filler card to help in that area
Duggan, Private Detective Im positive theres a good use for this in a Simic deck that doesnt want to run fight spells or bounce spells for removal, but Duggan, Private Detective cant be what you usually want
As Holt puts it, nothing comes for free for other players. In a way, this also helps capture the horrific setting of Duskmourn, and tie Endless Punishment back to the overarching theme of the corresponding Magic set
The Exodus set in 1998 standardized this by introducing color-coded symbols
As I touched on above, we can potentially choose from a wealth of different subthemes when upgrading the deck, or even combine them freely