Lightning Bug Capsule

When Lightning Bug Capsule enters the
battlefield, create three 0/1 colorless Firefly
creature token that can't attack or block.
{t}: add {c}.
{t}, sacrifice a firefly: add one mana of any
color to your mana pool.
When Lightning Bug Capsule leaves the
battlefield, create a 1/1 colorless Firefly
creature token with Flying.