Brokkos, Apex of Forever | Infested Thrinax | Pitiless Plunderer

(and one other card)

Cast
Infested Thrinax by paying ({3} magic symbol) ({B} magic symbol) ({G} magic symbol) .
When
Infested Thrinax enters the battlefield, it triggers, causing you to create a number of 1/1 Saproling creature tokens when a nontoken creature you control dies.
Activate
Altar of Dementia by sacrificing
Brokkos.
When
Brokkos dies,
Infested Thrinax and
Pitiless Plunderer trigger.
Resolve the
Infested Thrinax trigger, creating six 1/1 Saproling creature tokens.
Resolve the
Pitiless Plunderer trigger, creating a Treasure token.
Resolve the
Altar of Dementia ability, causing target player to mill cards equal to
Brokkos's power.
Activate
Altar of Dementia four times by sacrificing four Saprolings.
When the Saprolings die,
Pitiless Plunderer triggers four times, creating four Treasure tokens.
Resolve the
Altar of Dementia abilities, causing target player to mill cards equal to the Saprolings' power.
Activate five Treasures by tapping and sacrificing them, adding ({2} magic symbol) ({UB} magic symbol) ({G} magic symbol) ({G} magic symbol) .
Cast
Brokkos from your graveyard for its mutate cost by paying ({2} magic symbol) ({UB} magic symbol) ({G} magic symbol) ({G} magic symbol) , putting it on top of a Saproling.
Repeat from step 3.