Here is a casual deck I have been playing to understand how improvise works. Improvise is a fixed Delve, which is good for the game, but bad for broken plays (remember Dig Through Time and Treasure Cruise?) By the way, Metallic Rebuke is truly awesome in a Blue/Artifacts deck.
One thing is to learn how Improvise works, and another is to play dynamic games. The current Standard is slow as molasses. Here is a Vintage version ready for solitaire play.
Here is a turn 4 finish.