The extent to which these were printed is dubious, although I recall hearing the print run was less than one out of every 1,000 packs
Multiple characters can be supported and one character can be supported by multiple characters
Plus, it has no legendary rule, which is another little bonus to consider
Why its a contender: This is the most efficient card-drawing spell ever printed, providing a massive resource advantage for a single mana
Between this and the fact that blacks best mana ramp spells only tend to thrive in specific niches of the Commander format, such as cEDH, mono and two color black decks, combo decks, and/or builds with reliable access to Urborg, Tomb of Yawgmoth, theres really no way to rank these cards
Other common plot and setting themes include the Gaia hypothesis, an apocalypse, the heroes' defiance against fate and the gods, and conflicts between advanced technology and nature