Spawning Pit has at least two charge counters on it.
Mana Needed
({1} magic symbol) available.
Steps
Activate
Spawning Pit's second ability by paying ({1} magic symbol) and removing two charge counters from it, creating three 2/2 Spawn artifact creature tokens.
Activate
Krark-Clan Ironworks by sacrificing a Spawn, adding ({C} magic symbol) ({C} magic symbol) .
Activate
Spawning Pit's first ability twice by sacrificing two Spawns, putting two charge counters on