Krypton

This land enters tapped. {t}: Add {u} or {r}. When Krypton is put into a graveyard from the battlefield, create a Kryptonite token. At the beginning of your upkeep, if Krypton is in your graveyard and no player controls a Kryptonite artifact, a random player creates a Kryptonite token if you control no scientists, otherwise you create a Kryptonite token.