Talimancy

You divine the future through dice, learning how successful you will be at attempting a specific action. Choose an attack roll, ability check, or saving throw you could reasonably attempt within the next hour, then roll 1d20. If you then attempt this attack roll, ability check, or saving throw, the number rolled while casting this spell replaces the number rolled for the attack, check, or saving throw. If you would be rolling with disadvantage the higher number rolled is replaced, while if you are rolling with advantage the lower number is replaced. You may not recast this spell for the same attack roll, ability check, or saving throw until the duration of the first casting has fully elapsed or the attack, check, or saving throw has been attempted with the previously rolled number, and you must clearly describe the attack, check, or saving throw you will be attempting (e.g. "if I attack the goblin chief with my longsword" or "if I have to resist the effects of the nearby wyvern's poison", but not "the next attack I make", "the next lock I try to pick", etc).

At level 5 you may roll 2 dice when you would be attempting an attack, check, or saving throw with either advantage or disadvantage, replacing both rolls with the numbers rolled while casting this spell. At level 11 the DM will tell you whether the roll (without applying any of your modifiers) will fail catastrophically (by 10 or more), fail normally, succeed normally, or succeed overwhelmingly (by 10 or more). At level 17 the DM will tell you the same, but while including your modifiers to the roll in that calculation.