Homebrew
Divination cantrip
Casting Time: 1 reaction (which you take in response to you or an ally within 30 feet of you failing an attack roll)
Range: 30 feet
Components: S
Duration: Instantaneous
You extend your hand and point a finger at the target of the triggering attack. The attacker can roll a d4 and add the number rolled to the attack roll, potentially turning it into a success.