Graveyard Tortoise

Crew {4}, Spacewalk, Flying, miasma 3 (Whenever this creature blocks, it deals damage to blocking creatures in the form of -1/-1 counters equal to this creature’s toughness.) Whenever Graveyard Tortoise blocks, create a 1/1 black tortoise creature token with spacewalk and miasma 1. Graveyard Tortoise’s power and toughness is equal to the number of vehicles in your graveyard and on the battlefield.