Ygra, Eater of All + Camellia, the Seedmiser + Yahenni, Undying Partisan

Ygra, Eater of All

Camellia, the Seedmiser

Yahenni, Undying Partisan

How it works

1. Activate Yahenni by sacrificing any other creature.
2. Because the creature is a Food due to Ygra, when it dies, Camellia and Ygra trigger.
3. Resolve the Ygra trigger, putting two +1/+1 counters on it.
4. Resolve the Camellia trigger, creating a 1/1 Squirrel creature token.
5. Resolve the Yahenni ability.
6. Repeat.