You may cast creature spells from your graveyard
Gravestone Elemental's power and toughness are equal to the number of creature cards in your graveyard.
Zombies you control get +1/+1
When Gravestone Elemental enters the battlefield create an X/X Demon creature token where X is the number of creature cards in your graveyard
Threshold – As long as there are seven or more cards in your graveyard, at the beginning of the end step, you may create a 4/3 black Horror creature token. When you do, you draw a card and lose 1 life.
Landfall Elemental mirrored pair