The Lich's Army

Indestructible, can't be countered, enters the battlefield tapped, only {b} can be spent on {x}.
You may have The Lich's Army gain the abilities
and toughness of any black creature with
converted mana cost {x}-3.
At the beginning of your end step, if you control
this and The Lich's Tomb, The Lich's Tome,
and The Lich's Infamy, then exile them and meld
them into The Lich Eternal, Death Made
Manifest.