Eye of the Storm + Runic Repetition + Seething Song

UR identity

Commander legal

The 3 combo pieces

What must be in place

An additional instant or sorcery with flashback and with mana cost {R}{R}{R}{R}{R} or less in hand or graveyard.
Enough mana available to cast the additional spell.

How to execute it

  1. Cast any instant or sorcery spell with flashback by paying its cost.
  2. Eye of the Storm triggers, exiling that card, then allowing you to cast copies of all spells exiled with Eye of the Storm.
  3. Resolve the Seething Song copy, adding {R}{R}{R}{R}{R}.
  4. Resolve the Runic Repetition copy, returning the card you cast in step 1 from exile to your hand.
  5. Resolve all other spell copies.
  6. Repeat.

What the combo produces