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I'm not even getting into the Mystic Callings that after level 6 you can have a likewise have one on each creature stored, like the Passageway of the Astral Wayfarer which allows you to summon the a creature you shunted for free while casting a full other spell or making full other use of your action. Or Throng of Allies for nova actions during boss fights -- just build up a dozen monsters in shunt. Who cares if they are gone at the end of their first round, by then the opponent is long dead. There are many more issues.

I'm not even getting into the Mystic Callings that after level 6 you can have on each creature stored, like the Passageway of the Astral Wayfarer which allows you to summon the a creature you shunted for free while casting a full other spell or making full other use of your action. Or Throng of Allies for nova actions during boss fights -- just build up a dozen monsters in shunt. Who cares if they are gone at the end of their first round, by then the opponent is long dead. There are many more issues.

But that is not even the main issue here. There is a reason polymorph does not allow you to create targets other than beasts: monsters have all kinds of insane special abilities that would be utterly unbalancing in the hand of player characters. Normally, the new Summon Monster spell introduced here has a safety valve in that the DM picks what you get, but with this feature, you can pick and choose yourself, and you over time can get anything up to CR6. Here is a nice selection of the things you could get.

• How about a pixie, CR 1/4, that provides polymorph, while you are level 3?
• How about getting a rust monster CR 1/2 and destroying metal vault doors with ease?
• How about an Intellect Devourer, CR2, that can stun any creature that fails a DC 12 Intelligence save? Want to take out a CR 17 Goristo demon? No problem, they only have Int 6. you can even have the Devourer Body thief them and control their body.
• How about a wererat, also CR2, that is immune to non-magical, unsilvered weapons and that most tier one opponets will not be able to hurt at all?
• How about a unicorn, CR4, that can teleport you and your pals, but does not need any spellcasting feature for that. Teleport at level 7 is surely balanced, no?

But that is not even the main issue here. There is a reason polymorph does not allow you to create targets other than beasts: monsters have all kinds of insane special abilities that would be utterly unbalancing in the hand of player characters. Normally, the new Summon Monster spell introduced here has a safety valve in that the DM picks what you get, but with this feature, you can pick and choose yourself, and you over time can get anything up to CR6. Here is a nice selection of things you could get. Some highlights that come to mind:

• How about a pixie, CR 1/4, that provides polymorph, while you are level 3?
• How about getting a rust monster CR 1/2 and destroying metal vault doors with ease?
• How about an intellect devourer, CR2, that can stun any creature that fails a DC 12 Intelligence save? Want to take out a CR 17 Goristo demon? No problem, they only have Int 6. you can even have the devourer Body Thief them and control their body.
• How about a wererat, also CR2, that is immune to non-magical, unsilvered weapons and that most tier one opponets will not be able to hurt at all?
• How about a unicorn, CR4, that can teleport you and your pals, but does not need any spellcasting feature for that. Teleport at level 7 is surely balanced, no?
• How about an umber hulk, CR5, that allows you to tunnel wherever you want leaving a conveniently human-sized tunnel in its wake and allowing you to entirely ignore or change dungeon layouts?

I'm not even getting into the Mystic Callings that you can have a likewise unlimited number of after level 6, one on each creature stored, like the Passageway of the Astral Wayfarer which allows you to summon the a creature you shunted for free while casting a full other spell or making full other use of your action. Or Throng of Allies for nova actions during boss fights -- just build up a dozen monsters in shunt. Who cares if they are gone at the end of their first round, by then the opponent is long dead. There are many more issues.

I'm not even getting into the Mystic Callings that after level 6 you can have a likewise have one on each creature stored, like the Passageway of the Astral Wayfarer which allows you to summon the a creature you shunted for free while casting a full other spell or making full other use of your action. Or Throng of Allies for nova actions during boss fights -- just build up a dozen monsters in shunt. Who cares if they are gone at the end of their first round, by then the opponent is long dead. There are many more issues.