Agadeems Awakening

“Return from your graveyard to the battlefield any number of target creature cards that each have a different converted mana cost X or less. <br>//<br> <strong>Agadeem, the Undercrypt</strong> <br> As Agadeem, the Undercrypt enters the battlefield, you may pay 3 life. If you don't, it enters the battlefield tapped. <br> T: Add B.”