Polymorph in its current form may be a bit too much, specifically for managing powerful enemies. This is the kind of spell that forced Lengedary Resistance to exist; a save or die that is so powerful and cheap that if something fails it, the encounter can be over before it begins.
Polymorph 5E — DnD spell explained 2024
D&D: The Five Best Critters to Polymorph Your Enemies Into - Bell of Lost Souls
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Dealing with Polymorph? : r/DMAcademy
How to Polymorph: 5e Spell Exhaustive Guide – Flutes Loot
5e] Do you feel ambivalent about being polymorphed?, Dungeons & Dragons / Fantasy D20 Spotlight, Page 2
That's a lot of polymorph : r/dndmemes
Can You Polymorph Yourself (D&D 5th Edition) - Game Out
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My DM let me polymorph a baddie into a newt if I made a stat block for it. He got better in about an hour : r/DungeonsAndDragons
D&D: The Five Best Critters to Polymorph Your Enemies Into - Bell of Lost Souls