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Swellow #72 (Pokemon Roaring Skies | Pokemon Cards) prices are based on the historic sales

Product Details Whenever Sephiroth enters or attacks, you may sacrifice another creature

Life is a resource thats meant to be spent, so he lets you pay life instead of spending black mana costs

It was a menace in its Standard

Since there's no better source than the actual emails, I'll be quoting them liberally throughout this article (in the cases where we need to reserve an idea for the future, the text will be replaced with bracketed italics summarizing it)

Our life-gain creatures put pressure on our opponent to remove them, but its one of those situations in which the opponent is really not happy using resources doing so