Beacon of Tomorrows either from your hand or from exile by paying ({6} magic symbol) ({U} magic symbol) ({U} magic symbol) , causing you to take an extra turn after this one and shuffle
Beacon of Tomorrows into your library.
At the beginning of your end step,
Soulherder's second ability triggers, blinking
Hoarding Broodlord.
When
Hoarding Broodlord enters the battlefield, it and
Soulherder's first ability trigger.
Resolve the
Soulherder trigger, putting a +1/+1 counter on it.
Resolve the
Hoarding Broodlord trigger, searching your library for Nexus of Fate and exiling it.