I'm playing an Abjuration wizard in 5e, and am currently level 4. Looking ahead to the 3rd level spell list, I come across the spell I've been waiting for: Counterspell.
And then, reading the rules, I find that it's potentially extremely broken.
In order for me to counter a spell of a higher level than the one I cast the spell, all I need to do is succeed on a spellcasting check equal to 10+the spell I'm countering.
At level 4, my bonus is +6. Next level it will be +7. That means that to counter a level 9 spell, I only need to get a 12 or higher- 40% chance of success.
Is that balanced? And if so, why?