Soul Collector + Bloodflow Connoisseur + Pandemonium

Soul Collector

Bloodflow Connoisseur

Pandemonium

How it works

1. Cast Soul Collector by paying 3.
2. When Soul Collector enters the battlefield, Pandemonium triggers, causing Soul Collector to deal damage to itself equal to its power.
3. If an ability from Bloodflow Connoisseur is waiting to resolve, let it resolve.
4. Activate Bloodflow Connoisseur by sacrificing Soul Collector.
5. When Soul Collector dies, it triggers, returning itself from your graveyard to the battlefield.
6. Repeat from step 2.