I’m deadly serious about this. I’d summon woodland creaurea or true polymorph is powerful then the ability to stop these things Is just as powerful and impactful.At any level Counterspell is the most powerful spell.
However Counterspell only uses a reaction rather than a bonus action
Can be cast at a lower level with a risk of failure
Can stop any spell (whereas each other spell can only do the things it’s designed to do)
It is undoubtably the most powerful spell in the game.