Cast Rite of Replication with kicker by paying ({7} magic symbol) ({U} magic symbol) ({U} magic symbol) , targeting Precursor Golem.
Precursor Golem's second ability triggers, creating a kicked copy of Rite of Replication targeting every other Golem.
Resolve the first Rite of Replication, creating five token copies of the Golem it is targeting.
If the Golem was Percursor Golem, the Percursor Golem tokens enter the battlefield, triggering their first abilities, creating a total of ten 3/3 Golem artifact creature tokens.
Repeat from step 3 for each other Rite of Replication.
Cast Chandra's Ignition by paying ({3} magic symbol) ({R} magic symbol) ({R} magic symbol) , targeting any Golem.
The six Percursor Golems' second abilities each trigger, creating six copies of Chandra's Ignition targeting every other Golem.
Resolve the first Chandra's Ignition, causing the Golem to deal damage equal to its power to each other creature and each opponent.
Repeat step 8 for each remaining Chandra's Ignition.