Excavating Anurid

Anouride excavateur (Excavating Anurid) (fr)

Creature - Frog Beast | Power/Toughness: 4 / 4 (CMC 5)
When Excavating Anurid enters the battlefield, you may sacrifice a land. If you do, draw a card.
Threshold -- As long as seven or more cards are in your graveyard, Excavating Anurid gets +1/+1 and has vigilance.