You may sacrifice a creature with a converted mana cost of 0, such as a token creature thats not a copy of another permanent, to cast a spell for its emerge cost
Star City used to have displays with their damaged cards, cards which they didnt list on their website because scans of each and every card is just not worth the time, aside from the most expensive ones like pieces of Power
1st Place from 59.000,00 Euro (Light Played) This card that was created for a special occasion by Richard Garfield
If you want off-color lifegain, look at Bottle Gnomes, Filigree Familiar, Fountain of Renewal, Ivory Tower, Navigators Compass, or any other of dozens of artifact cards that gain life at two to three mana
He just wanted to make something he wanted to play