Colfenor, the Last Yew + Saffi Eriksdotter + Pitiless Plunderer + Ashnod's Altar

Colfenor, the Last Yew

Saffi Eriksdotter

Pitiless Plunderer

Ashnod's Altar

How it works

1. Activate Saffi Eriksdotter by sacrificing it targeting Colfenor.
2. Colfenor and Pitiless Plunderer trigger.
3. Let the Colfenor trigger resolve, declining to return anything.
4. Resolve the Pitiless Plunderer trigger, creating a Treasure token.
5. Resolve the Saffi Eriksdotter ability, creating a delayed trigger that will return Colfenor to the battlefield when it dies.
6. Activate Ashnod's Altar by sacrificing Colfenor, adding CC.
7. Colfenor, Pitiless Plunderer, and Saffi Eriksdotter trigger.
8. Resolve the Colfenor trigger, returning Saffi Eriksdotter to your hand.
9. Resolve the Pitiless Plunderer trigger, creating a Treasure token.
10. Resolve the Saffi Eriksdotter trigger, returning Colfenor to the battlefield.
11. Cast Saffi Eriksdotter by sacrificing the two Treasure tokens.
12. Repeat.