Sedimentary Bones

When Sedimentary Bones enters the battlefield,
exile a dinossaur card from your graveyard with it.
{1}: Put a excavation counter on Sedimentary
Bones.
{t}, sacrifice Sedimentary Bones: Put elixed card
with Sedimentary Bones onto the battlefield
under your control. Use this ability only its
converted mana cost is less or equal excavation counters in Sedimentary Bones.