Vaal Grace Unlucky explanation

One of the vaal grace effect is Suppressed Spell Damage dealt to you is Unlucky.
I cant understand the meaning of that. Can anyone please explain.
Do it means I get spell critical strike from enemy easier
Or I get three rolls if I also have the mastery that Chance to Suppress Spell Damage is Lucky?

Read wiki - unlucky.

The suppressed damage gets rolled twice and it picks the worst result causing you to take potentially slightly less damage.

So i you have vaal grace and lucky suppression from mastery damage gets rolled 3 times?

I don't think it stacks. The wiki mentions that unlucky and lucky will nullify each other, but it doesn't seem to mention more complex interactions.

There is a recent thread related to this.

https://www.pathofexile.com/forum/view-thread/3547095

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Fakecrash wrote:

So i you have vaal grace and lucky suppression from mastery damage gets rolled 3 times?

To begin with, there is no such thing as "doubly lucky" or "doubly unlucky". It's like how "hits deal double damage" and "hits deal triple damage" don't stack, or how "chance for hits to deal double damage" from multiple sources add together rather than giving a chance to deal 4x damage.

However, you're mixing up two different stats.

The spell suppression mastery makes the chance to suppress spell damage lucky. This means that if you have less than 100% chance to suppress spell damage, you basically have two chances to suppress spell damage from a hit. The mastery doesn't change the damage you take, except by making you more likely to suppress spell damage.

IF you suppress the spell damage, Vaal Grace would then make the damage unlucky.