A lizard folk race for a marsh/swamp country

Can you tell me your opinion about this race ? 

Ssillack Lizardfolk

Creature Type. Humanoid
Size. Medium
Speed. 30 feet

Darkvision

You have Darkvision with a range of 60 feet.

Hold Breath

You can hold your breath for up to 15 minutes.

Marsh Adaptation

Difficult Terrain caused by mud, silt, shallow water, or swamp vegetation doesn’t cost you extra movement.

Swim Speed

You have a Swim Speed equal to your Speed.

Keen Senses

You gain proficiency in one of the following skills of your choice: Insight, Perception, or Survival.

Poison Resilience

You have Resistance to Poison damage. You also have Advantage on saving throws you make to avoid or end the Poisoned condition.

Regeneration

You have {{proficiency}} Regeneration Dices (equal to your proficiency). These dice are d6s.

During a Short Rest, you can expend one or more of these dice, roll them, and regain a number of Hit Points equal to the total rolled.

You regain all expended Regeneration Dice when you finish a Long Rest.