Warriors Luck

You touch a creature and grant it Valkyrian luck. For the duration of the spell, any number 1 through 6 the creature rolls on a weapon attack roll is treated as a 7. Additionally, any 1 or 2 rolled on a die for the creatures weapon damage is treated as a 3.

When the affected creature fails a saving throw, it can choose to reroll it, ending the spell.

Using a Higher-Level Spell Slot. The minimum weapon attack roll die number increases by 1 for each spell slot level above 3.