Took me a while to figure that cumulative = stackable.
I don't think the upped needs 2 turn delay, it is even weaker than the unupped. Interesting idea though, this could help in an OTK or in a stall, or even in a mono , since the creatures are quite expensive.
The upped is more suited to stall the opponent imo.
Fractix + dry spell also seems like a good combo (if you kill your own phoenixes the ashes are entirely new creatures and hence have no delay). Squeezing some quantum pillars, novas or immos should be enough to power the
part.