I would avoid doing that myself. I'm not looking for something game-breaking, just maximizing what is allowable by the rules. Also, just FYI, a Great Wyrm Gold Dragon knows and can cast spells as a 19th level sorcerer, so it could know Gate as one of its spells and produce the same Cascade...
I have a LG 22nd level cleric and have never cast Gate, but we have some climactic battles coming up and I would like a little extra help and am willing to spend the XP for it. So under the rules as I interpret them, I could bring in one 44 HD critter, or multiple other critters as long as their...