Clerics are a creature type with substantial typal support, particularly in white and black. Cleric decks commonly combine life gain, sacrifice, graveyard recursion, and effects that reward you for maintaining a congregation of the creature type.
Edgewalker reduces the cost of Cleric spells, Orah, Skyclave Hierophant returns fallen Clerics from your graveyard, and Cabal Archon turns all your Clerics into a double Blood Artist if you pay a black mana and sacrifice them.
