Yeah that makes since.
Well lets see what happens:
EOT Intuition for past, rite, rite


for Past in flames + flashback rite (

floating)
Flashback intuition for intuition + rite + manamorphose (

floating)
Cast rite with two in yard (

)
Cast rite with one in yard (

)
cast manamorphose (

)
Cast intuition getting seething song, manamorphose, tendrils (

)
Cast seething song (

)
Cast manamorphose (

)
Cast tendrils for exactly 10!
So that takes 6 mana after EOT intuition. Not as much as seven but still not great. However, you would have a lot less dead cards and could play tons of rituals. Also, this is a storm deck that could use portent as you only need one intuition to reach 10 storm. And base red means shattering spree maindeck.
edit - Hm, this...doesn't work. Back to the drawing board!
Edit 2This does work but costs seven to get going, eight if they give you manamorphose.
EOT Intuition for past, seething song, manamorphose

for Past in flames + flashback seething song (

floating)
Cast manamorphose (

)
Cast intuition for intuition + rite of flame + rite of flame (

)
Cast rite, one in graveyard (

)
Cast intuition for rite + manamorphose + tendrils (

)
Cast rite, one in grave (

)
Cast rite (

)
Cast manamorphose (

)
Cast tendrils for exactly 10!
I'm certain there is a better way, but it is powerful to be able to storm to 10 off one card.
Edit 3As I now read the card...does this only work for cards in the grave at the time past in flames resolves? Because that would be Bolshevism! Pure Bolshevism!