Twitching Doll and Pemmin's Aura on the battlefield (Pemmin's Aura attached to Twitching Doll).
Twitching Doll does not have summoning sickness.
Steps
Activate Twitching Doll's first ability by tapping it, adding ({U} magic symbol) and putting a nest counter on it.
Activate Pemmin's Aura's first ability by paying ({U} magic symbol) , untapping Twitching Doll.
Repeat any number of times.
Activate Twitching Doll's second ability by tapping it and sacrificing it, creating a 2/2 green Spider creature token with reach for each counter on Twitching Doll.