Homebrew
Divination cantrip
Casting Time: 1 reaction (which you take in response to you or an ally within 30 feet of you failing an Ability Check)
Range: 30 feet
Components: V, S
Duration: Instantaneous
You channel magical insight to the creature who failed the Ability Check. That creature can roll a d4 and add the number rolled to the check, potentially turning it into a success.