Soul Collector + Pandemonium + Marauding Raptor

Soul Collector

Pandemonium

Marauding Raptor

How it works

1. Cast Soul Collector by paying 2.
2. When Soul Collector enters the battlefield, Pandemonium and Marauding Raptor trigger.
3. Resolve the Pandemonium trigger, causing Soul Collector to deal damage to itself equal to its power.
4. Resolve the Marauding Raptor trigger, dealing 2 damage to Soul Collector.
5. Soul Collector dies as a state-based action due to having 0 or less toughness.
6. Soul Collector triggers, returning itself from your graveyard to the battlefield.
7. Repeat from step 2.

This loop sets up a perpetual cycle of life and death, turning Soul Collector into an engine that constantly loops through the battlefield and graveyard. As Soul Collector enters, Pandemonium allows it to deal damage to itself while Marauding Raptor contributes another 2 damage, pushing Soul Collector's toughness to zero and sending it straight to the graveyard. Because Soul Collector dealt damage to itself that turn, its own triggered ability immediately resurrects it, bringing it right back onto the battlefield to trigger Pandemonium and Marauding Raptor all over again.