Zinnia, Valley's Voice + Appa, Steadfast Guardian + Priest of Urabrask + Elspeth, Storm Slayer

Zinnia, Valley's Voice

Appa, Steadfast Guardian

Priest of Urabrask

Elspeth, Storm Slayer

How it works

1. Cast Priest of Urabrask by paying its mana cost plus an additional 2 for its offspring cost.
2. When Priest of Urabrask enters, its innate ability and its offspring ability trigger.
3. Resolve the innate Priest of Urabrask trigger, adding
4. Resolve the offspring trigger, creating two token copies of Priest of Urabrask that are 1/1.
5. When the Priest of Urabrask tokens enter, they each trigger, adding six .
6. Cast Appa by paying its mana cost plus an additional 2 for its offspring cost.
7. When Appa enters, its innate ability and its offspring ability trigger.
8. Resolve the innate Appa trigger, airbending the nontoken Priest of Urabrask.
9. Resolve the offspring trigger, creating two token copies of Appa that are 1/1.
10. Put both Appa tokens into your graveyard due to the legend rule.
11. Both Appa tokens' enter-the-battlefield ability trigger, airbending Appa with one trigger and nothing with the other.
12. Cast Priest of Urabrask from exile by paying 2 plus an additional 2 for its offspring cost.
13. Repeat steps 2 through 5 once.
14. Cast Appa from exile by paying 2 plus an additional 2 for its offspring cost.
15. Repeat from step 7.