Shoulder To Shoulder

As long as you control 3 or more creatures,
creatures you control get +1/+1 and vigilance.

As long as you control 5 or more creatures,
creatures you control get +1/+1 and first strike.

As long as you control 10 or more creatures,
creatures you control get +1/+1 and flanking.

As long as you control 15 or more creatures,
creatures you control get +1/+1 and trample.