Counterspell (HB)

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 targets spellcasting ability check. Both sides may add their proficiency modifier to their roll, however, the target of the spell may add +/- 2 for each level above or below the target spell was cast of Counterspell (level 3). 

On a failure, the target caster's spell succeeds and takes takes effect. 

On a success, the target caster's spell fails and takes no effect.

On a tie, both sides continue to roll until one side wins over the other.