Counterspell (R)

You attempt to interrupt a creature in the process of casting a spell. Make an ability check using your spell attack modifier contested by the target casters spell DC. if the spell attempting to be countered is a bonus action or reaction you must roll a contested initiative check in order to cast this spell, if you fail so does this spell.

• On a failure, the target caster's spell 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.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, you gain a bonus to your checks equal to the number of levels above 3rd you used.