Brokkos, Apex of Forever + Infested Thrinax + Pitiless Plunderer + Phantom Train

Brokkos, Apex of Forever

Infested Thrinax

Pitiless Plunderer

Phantom Train

How it works

1. Cast Infested Thrinax by paying 3.
2. 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.
3. Activate Phantom Train by sacrificing Brokkos.
4. When Brokkos dies, Infested Thrinax and Pitiless Plunderer trigger.
5. Resolve the Infested Thrinax trigger, creating six 1/1 Saproling creature tokens.
6. Resolve the Pitiless Plunderer trigger, creating a Treasure token.
7. Resolve the Phantom Train ability
8. Activate Phantom Train four times by sacrificing four Saprolings.
9. When the Saprolings die, Pitiless Plunderer triggers four times, creating four Treasure tokens.
10. Resolve the Phantom Train abilities
11. Activate five Treasures by tapping and sacrificing them, adding 2U/B.
12. Cast Brokkos from your graveyard for its mutate cost by paying 2U/B, putting it on top of a Saproling.
13. Repeat from step 3.

This intricate loop relies on a continuous cycle of sacrifice and recursion, starting when you feed Brokkos, Apex of Forever to Phantom Train's activation cost. The moment Brokkos hits the graveyard, Pitiless Plunderer generates a Treasure token while the flash-enabled Infested Thrinax triggers to spawn a swarm of Saproling tokens scaled to the sacrificed creature's massive power. You then use Phantom Train to sacrifice those newly created Saprolings, which in turn fuels Pitiless Plunderer to amass even more Treasures. Finally, by cashing in those accumulated Treasures for mana, you can cast Brokkos straight from your graveyard using its mutate ability to restart the whole cycle and achieve infinite value across every relevant category.