Agadeem's Awakening // Agadeem, the Undercrypt

Oracle Text

[Agadeem's Awakening]
Return from your graveyard to the battlefield any number of target creature cards that each have a different mana value X or less.

[Agadeem, the Undercrypt]
As this land enters, you may pay 3 life. If you don't, it enters tapped.
{T}: Add {B}.