Blasting Station by tapping it and sacrificing another nontoken green Insect.
When the Insect dies,
Zask and
Verdant Succession trigger.
Resolve the
Zask trigger, putting the Insect on the bottom of your library from your graveyard and causing you to mill two cards.
Resolve the
Verdant Succession trigger, searching your library for that Insect and putting it onto the battlefield.
When the Insect enters,
Blasting Station triggers, untapping
Blasting Station.
Resolve the
Blasting Station ability from step 1.
Repeat.
Notes
Eventually the combo will stop in step 3, as the Insect will be milled into your graveyard. Note that you must control another nontoken green Insect besides