Once you have a stocked graveyard, there are a few different ways you can interact with it
My favorite thing to do is play Harmonic Prodigy and make up to 12 treasures in a single combat before firing off Dragonspark Reactor
If the target land is an illegal target as Preston Garvey's first ability tries to resolve, it won't resolve and none of its effects happen
The precon even has an infinite combo included in it, making for the best Bant Commander precon you can get
Supervillain Rumble Archenemy also has an alternate format for a four-player free-for-all Supervillain Rumble, where everyone uses a scheme deck and each player is considered an Archenemy
Commander, on the other hand, is chock-full of this Ice Age blue enchantment, and it's probably one of the most-feared turn-1 plays a blue deck can make