Text (UG+errata): You and your teammates may sacrifice any number of creatures. For each creature sacrificed in this way, add {B}{B} to your mana pool. [Oracle 2009/07/08]
You may not sacrifice real organs (body, pipe, etc.) to gain mana. [Barclay 1998/08/13]
Only you (the caster) get the mana. [Barclay 1998/08/13]
It is not a mana ability. It is a sorcery that happens to produce mana during resolution. [DeLaney 2000/03/17]
All tournament formats have banned cards from Unglued.
