All other permanents on the battlefield (Stenn with "Artifact" chosen).
You have at least one land card in hand.
({1} magic symbol) available.
Steps
Cast Chromatic Sphere from your graveyard by paying ({0} magic symbol) and discarding a land card from your hand.
Activate Chromatic Sphere by paying ({1} magic symbol) , tapping and sacrificing it, adding ({1} magic symbol) and causing you to mill two cards and return a land card from your graveyard to your hand.