Portentuous Strike

Divination cantrip
Casting Time: 1 action
Range: Self (5-foot radius)
Components: S, M (a melee weapon worth at least 1 sp)
Duration: 1 round
You brandish the weapon used in the spell’s casting and make a melee attack with it with disadvantage against one creature within 5 feet of you. (This disadvantage may not be canceled out by advantage.) On a hit, you may predict a future attack against it. Record the number of the unused die. You can replace any attack roll made against this creature before the start of your next turn with the number rolled, and grant the attack a bonus to damage equal to your spellcasting modifier.
At Higher Levels. At 5th level, the melee attack and the foretold attack each deal an extra 1d6 Radiant damage to the target on a hit. Both damage rolls increase by 1d6 at 11th level (2d6 and 2d6 + Spellcasting modifier) and again at 17th level (3d6 and 3d6 + Spellcasting modifier).
Spell Lists. Bard, Cleric, Wizard