Golgari Swarm Leader

When Golgari Swarm Leader enters the battlefeild, put {x} 1/2 Golgari Swarm creature tokens onto the battlefeild.
{x}{x}{t} Put {x} 1/2 Golgari Swarm creature tokens onto the battlefeild.
When Golgari Swarm Leader leaves the battlefeild, put {x} 1/2 Golgari Swarm creature tokens with flying onto the battlefeild, where {x} is the number of Golgari Swarm Bug creature tokens under your controll.