Requires

Saffi Eriksdotter must be on the battlefield. Crypt Champion must be in hand. Mana needed: in non-red mana

Steps

1. Cast Crypt Champion by paying , ensuring not to spend to cast it.
2. Crypt Champion enters the battlefield, triggering its first and second abilities.
3. Holding priority, activate Saffi by sacrificing it, targeting Crypt Champion.
4. Resolve the first Crypt Champion trigger, returning Saffi from your graveyard to the battlefield.
5. Resolve the second Crypt Champion trigger, sacrificing it.
6. Saffi triggers, returning Crypt Champion from your graveyard to the battlefield.
7. Repeat from step 2.

Results