Soulherder trigger, putting a +1/+1 counter on it.
Resolve the
Hoarding Broodlord trigger, searching your library for
Nexus of Fate if it's in your library, and exiling it.
Cast
Nexus of Fate either from your hand or from exile by paying ({5} magic symbol) ({U} magic symbol) ({U} magic symbol) , causing you to take an extra turn after this one and shuffle