Thopter Squadron has at least two +1/+1 counters on it.
({1} magic symbol) available.
Steps
Activate Thopter Squadron's first ability by paying ({1} magic symbol) and removing a +1/+1 counter from it, creating a 1/1 Thopter artifact creature token.
Activate Krark-Clan ironworks by sacrificing the Thopter, adding ({C} magic symbol) ({C} magic symbol) .
When the Thopter dies, Death's Presence triggers, putting a +1/+1 counter on Thopter Squadron.