The most obvious of these factors is the synergy of haste with Saproling Burst, which was known to some as "The Fix." That extra turn almost doubled the strength of the Burst and made it hit for the full 20 damage in only two turns, which would normally mean a kill on turn five, or turn four if backed up by a Blastoderm
Marcy: Geez, someone at WoTC really likes Ultimecia
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We remember pictures faster than long explanations, especially when those pictures repeat in the same place
Most of them cost just a few dollars or less and highlight what black does best: efficient creature removal, recursion from the graveyard, sacrifice payoffs that turn losses into value, and life drain effects that slowly wear down opponents
Plus, its not half bad as a 5/5 creature that can Raise Dead when it enters and when it attacks