Kiki-Jiki, Mirror Breaker + Blazing Firesinger // Seething Song + Hematite Talisman + Semblance Anvil

Kiki-Jiki, Mirror Breaker

Blazing Firesinger // Seething Song

Hematite Talisman

Semblance Anvil

How it works

1. Activate Kiki-Jiki by tapping it, copying Blazing Firesinger. It'll enter prepared due to its effect.
2. Cast a copy of Seething Song by paying due to Semblance Anvil.
3. Hematite Talisman triggers, causing you to pay 3 to untap Kiki-Jiki.
4. Resolve Seething Song, adding .
5. Repeat.

This clever loop relies on Kiki-Jiki, Mirror Breaker to continuously clone Blazing Firesinger, whose prepared nature lets you cast a copy of Seething Song for a mere {R} thanks to Semblance Anvil reducing your spell costs. As that red spell goes on the stack, Hematite Talisman triggers to let you feed it some of the mana you are generating, untapping Kiki-Jiki so the whole process can start anew. Because Seething Song refunds you five red mana while only costing one and an untap fee, you're left with a steadily growing surplus of mana along with an endless army of hasty tokens.