Abraham's Altar

Sacrifice a creature: Add {p/c} to your mana pool.
{1}, Return a creature you control to its owner's hand: Add one mana of any color to your mana pool.
Then God said, "Take your son, your only son, Isaac, whom you love, and go to the region of Moriah. Sacrifice him there as a burnt offering on one of the mountains I will tell you about." - Genesis 22:2