Gravekeeper's Throne

This card cost {1} less to cast for each card in gra-
veyards.
While you control both Necrovalley and a Grave-
keeper creature, you can:
{1}{c}{t} Counter target noncreature spell.
{3}{c} Draw 2 cards.
If you dont control both Necrovalley and a Gra-
vekeeper creature, destroy this card.