Unrealized Potential

This is a dunamancy(chronurgy) spell.

You focus, survey, and capture the ineffable potential of the possible futures and unrealized pasts. Roll 6d4 and record the result, this is known as your Pool of Potential and it lasts until you take a long rest. If you cast this spell again while already having a Pool of Potential, the new result is added to the existing Pool of Potential.
Whenever an attack roll, ability check, or saving throw is rolled and you can see the target, you can use your reaction to reduce your Pool of Potential by any number equal to or lower than 5, and either add it to or subtract it from the attack roll, ability check, or saving throw. You can use this reaction after you see the roll, but before you know whether it succeeded or failed.
At Higher Levels: When you cast this spell using a spell slot of 7th level or higher, roll an additional d4 for the initial result.