Devour Magic

You can use your reaction when another creature casts a spell. If the creature is casting a spell of 3rd level or lower, its spell is devoured and has no effect then you gain 3 sorcery points. If it is casting a spell of 4th level or higher, make an ability check using your spellcasting ability. The DC equals 10 + the spell's level. On a success, the creature's spell is devoured and you gain sorcery points equal to the spell level. 

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the interrupted spell is devoured successfully if its level is less than or equal to the level of the spell slot you used.