Combo!

On a successful melee attack, flip 1d2, and add the resulting effect to the next attack, and stack with themselves and each other

On a 1, add +2 to your next attack against the same creature.

On a 2,  add 1d6 damage to your next attack against the same creature.

This feat resets on a missed attack roll, if you change the target of your attack, or if you do not attack for a round.

For example, hitting the first time and rolling a 1 means your next attack has a +2 on the next attack. A hit with the next attack and a roll of 1 would grant a +4 on the next attack.