Acolyte

You can have up to fifteen of this card in your deck.
Only 5 Acolytes can be on the field at a time. If another is played, instead send it to the graveyard.
Tap two untapped Acolytes: Add {1} to your mana pool, this can only be spent on buildings
Tap five untapped Acolytes: add {b}{b} to your mana pool
The damned stand ready