Cast a copy of Seething Song from exile by paying 2, adding .
When you cast that spell, Runaway Steam-Kin triggers, causing you to put a +1/+1 counter on it.
If Runaway Steam-Kin has three +1/+1 counters on it, activate it by removing those counters, adding .
Activate Emiel the Blessed by paying 3, blinking Blazing Firesinger, which enters prepared.
Repeat.
This loop centers on an infinite mana and recursion engine powered by Blazing Firesinger // Seething Song and Emiel the Blessed. By casting the Seething Song side from exile, you generate a massive burst of red mana while triggering Runaway Steam-Kin, which conveniently accrues the +1/+1 counters needed to feed its own mana-producing ability. Once your mana and counters are aligned, you use Emiel the Blessed to blink the Firesinger, resetting its prepared status so you can cast the ritual all over again.