Lurrus and You have not cast a spell using Lurrus this turn.
It is your precombat main phase.
({1} magic symbol) ({B} magic symbol) available.
Steps
Cast Dance of the Dead from your graveyard by paying ({1} magic symbol) ({B} magic symbol) , returning Liliana, Heretical Healer from your graveyard to the battlefield with Dance of the Dead attached.
When Lurrus dies, Liliana, Heretical Healer triggers, causing you to exile it and return it to the battlefield as Liliana, Defiant Necromancer, and create a 2/2 Zombie creature token.
Activate Phyrexian Altar by sacrificing the Zombie, adding ({1} magic symbol) .
Activate Liliana, Defiant Necromancer's second loyalty ability by removing three loyalty counters from it.
Liliana dies as a state-based action due to having zero loyalty.
Resolve the Liliana ability, returning Loyal Retainers from your graveyard to the battlefield.
Activate Loyal Retainers by sacrificing it, returning Lurrus from your graveyard to the battlefield.