Counterspell [The Dungeon Coach]

You attempt to interrupt a creature in the process of casting a spell. The target spell must have a casting time of 1 action.

Make a spellcasting ability check contested by the target's spellcasting ability check. You both gain a +1 bonus to your check for every level you are casting your spell above your opponent's spell level, or a -1 penalty to you check for every level you are casting your spell below your opponent's spell level.

On a failure, the target caster's pell succeeds and takes effect.
On a success, the target caster's spell fails and has no effect.
On a tie, the target caster's spell fails, has no effect, and both you and the target caster must roll on the wild magic surge table.

If the target caste's spell fails, they can immediately cast a cantrip as part of the same action they used to cast their spell.

This spell cannot be cast at higher levels.