Oh well, I figured I was misinterpreting something somewhere. Still an absurdly big number fairly simply. My mistake for misinterpreting the notation. Guess thats the problem with numbers that big, you really just cannot even wrap your head around just how big they are.
I am surprised that Radiate hasn't shown up in the lists posted here. I didn't exactly do an exhaustive search but having a modest number of animated doubling season in play (say 20) would result in an absolutely absurd number of doubling seasons if you were to cast a (kicked) rite of replication and then radiate it. Since each copy would resolve independently this alone would generate in excess 2^^^^^^^^^^^^^^^^^^^^20 (2->20 in that link I think)(that's under representing it) in play. Making the follow up radiated rite of replication generate... well a number I'm not even able to comprehend. Effectively each radiated copy spell would create a nested exponential for as many permanents as there are in play. I mean really, even after two/three resolutions of rite+radiate you are looking at numbers that make the http://www.soniccenter.org/sm/mtg/megacombo.html link look tiny. (2->20)->(2->20)
Why are there not more magic cards with taco themes?