Cast Sacrifice by paying ({B} magic symbol) and sacrificing Scholar of the Ages, adding seven ({B} magic symbol) .
Cast Entreat the Dead for X = 1 by paying ({2} magic symbol) ({B} magic symbol) ({B} magic symbol) ({B} magic symbol) , returning Scholar of the Ages from your graveyard to the battlefield.
Scholar of the Ages triggers, returning Sacrifice and Entreat the Dead from your graveyard to your hand.
Repeat any number of times.
Once you have infinite mana, you may choose any amount for X in step 2.
Results
Infinite black mana.
Infinite blinking.
Infinite death triggers.
Infinite ETB.
Infinite LTB.
Infinite magecraft triggers.
Infinite sacrifice triggers.
Infinite storm count.
Return all creatures from your graveyard to the battlefield.