Requires

Reiterate must be in hand. Seething Song must be in hand. Bonus Round must be in hand. Mana needed:

Steps

1. Cast Bonus Round by paying .
2. Cast Seething Song by paying .
3. Bonus Round triggers, creating a copy of Seething Song.
4. Resolve the Seething Song copy, adding .
5. Holding priority, cast Reiterate with buyback by paying , creating a copy of Seething Song.
6. Bonus Round triggers, creating a copy of Reiterate.
7. Resolve the Reiterate copy, creating a copy of Seething Song.
8. Resolve the second Seething Song copy, adding .
9. Resolve the first copy of Seething Song, adding .
10. Repeat from step 5.

Results