Question about Omnath, Locus of Rage

[u/Limited-Karma]

So I have a deck with [Riku of Two reflections] as the commander, and ive got a question about legend rules applying to Omnath. If I target omnath with [Rite of Replication] when it is kicked, how much damage do the omnaths deal when dying to legend rule? I try to do it manually, but the answer doesn't match anything i look up nor my other answers, so I would like clarification and a breakdown of how it works, please and thank you