Text (MR): At the beginning of your precombat main phase, add {B} to your mana pool for each charge counter on ~this~. ; {7},{Tap}: Destroy target creature. Then put a charge counter on ~this~.
You put a counter on this even if the creature regenerates. [Mirrodin FAQ 2003/10/01]
The precombat main phase is the first main phase of the turn. All others are postcombat main phases. [Mirrodin FAQ 2003/10/01]
