Gangstalker

You may have any number of Gangstalker in
your deck.
Other creatures named Gangstalker get +1/+1.
If you control 5 or more creatures named Gangstalker creatures you control gain first strike.
If you control 7 or more creatures named Gangstalker creatures you control gain shadow.
If you control 10 or more creatures named Gangstalker creatures you control gain indestructible.