
Bellona |

My advice would be to save the concept for Kingmaker or Giantslayer. (And Serpent's Skull, apparently, if you're not tied to the idea of a giant mammoth but are willing to go for any over-sized mount.)
Alternatively, start to keep a couple of Reduce Animal spells prepared. Hmmm, I wonder if one can stack those spells on one target ... ?

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Transmutation spells that change size can't be stacked unfortunately.
"You can only be affected by one polymorph spell at a time. If a new polymorph spell is cast on you (or you activate a polymorph effect, such as wild shape), you can decide whether or not to allow it to affect you, taking the place of the old spell. In addition, other spells that change your size have no effect on you while you are under the effects of a polymorph spell." PRD