Color Tag

While you make a melee weapon attack, you call the name of a color you choose to attack and you can attack nothing else. If the color only exists on the creatures you intend to attack, you deal an additional damage die on a hit. If the color exists on both you and the intended creatures, you instead deal max damage, including the additional damage die on a hit. 

At Higher Levels. When you cast this spell using a 3rd or 4th level spell slot, the additional damage die increases to 2. When you cast it using a 5th or 6th level spell slot, the additional damage die increases to 3. When you cast this spell using a spell slot of 7th level or higher, the additional damage die increases to 4.