Meirril wrote:I know OP doesn't want to hear this, but I'll say it anyways. Player brought this up for a game I was running a few years ago. It should work by RAW, but as GM I said no. Because that specific combination would be annoying if a player constantly abused it. Especially if they cast it multiple times. Nobody wants to sit through a 20 minute turn while the party wizard decides what his 15 summoned monsters are all going to do.Sure but I mean If you have a wizard with 15 2nd level spells and 15 of what ever slot they are burning for the summon they could be doing a lot worse things likely.
Read the title of this thread. There is a significant reason why Heighten Spell is mentioned. You make a wand of alter summoned monster, then prepare as many spell slots of 2nd level or greater you want to with Mount, heightened to the level of the spell slot. Your Mount spells can be turned into a summon monster X where X is the spell level that the mount spell was heightened to.
Most dungeon crawls don't last more than a few hours. But your caster can blow through all of his mount spells before he enters the dungeon and will have those summoned creatures through the entire run.
The most limited resource in Pathfinder is actions. Having your caster take most of his actions hours before combat begins and being able to take a dozen more actions than the rest of his party is not only unbalanced, but will also make combat drag on while the caster controls his mob of summons.