Similar to Nicademus suggestion, you can create a power in you action tab. Call it "Lucky" and an effect coded as follows: Lucky; (N) Reroll 1's on attack, check and saves. Apply the effect to your character and each time your character is up in the combat tracker your DM will see the effect in chat next to your name. For me the "N" represents that it is a note and not a true effect, but rather a reminder. You could also even add a sound trigger to it through dulux-oz's sound extension, but that might get irritating as it will trigger every time it is your character's turn! (Meaning, you could tie a chat trigger to "Reroll").