Activate a basic Forest by tapping it, adding ({G} magic symbol) .
Activate Void Attendant by paying ({1} magic symbol) ({G} magic symbol) and putting a card an opponent owns from exile into their graveyard, creating a 1/1 Eldrazi Scion creature token.
When the Eldrazi Scion enters the battlefield as a Rat due to Arcane Adaptation, Lord Skitter's first ability triggers, exiling a card from an opponent's graveyard.
Activate Earthcraft by tapping the Eldrazi Scion, untapping a basic Forest you control.
Activate the Eldrazi Scion by sacrificing it, adding ({C} magic symbol) .