Counterspell (Alt) (HB)

You attempt to interrupt a creature in the process of casting a spell. You and the target both make an ability check with your respective spellcasting abilities. The target adds the level of the spell it is casting to its ability check, and you add the level at which you cast this counterspell to your ability check. If you know the spell the creature is attempting to cast or if you have it prepared you have advantage on this ability check, unless you are using this spell against another counterspell. If the result of your ability check is greater then the result of the target's ability check, its spell fails and has no effect.