Sleetha, the Spider Queen

Reach, Other spiders you control get +1/+1.
When Sleetha, the Spider Queen enters the battlefield gain control of all spiders.
{t}, Sacrifice a spider you control, choose one:
~Exile Sleetha, the Spider Queen then return her to the battlefield.
~Destroy target creature. It's owner puts into play X 1/2 spider tokens with reach where X is the destroyed creature's power.