Reiterate + Pyretic Ritual + Bonus Round

Steps

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