Drawing cards during an opponents turn spawns Tentacle tokens, and losing one of those tentacles untaps The Watcher and stuns something else
Put any number of land cards from among them onto the battlefield tapped, then shuffle
Theme According to Commander deck breakdown, it is not strictly necessary
It plays well in flash shells like Nymris, Oona's Trickster and Alela, Cunning Conqueror, and its a fun reminder to people that firebending doesnt affect the color identity of a card, since reminder text isnt factored into color identity
Cloudstone Curio only has two printings (one of them being a premium Kaladesh Invention), and retails for about $65 as a result
Blue-Red: Artifact Aggro Blue-red also values artifacts, but uses them to fuel a fast, aggressive playstyle