If so, no excess damage will be dealt even if your trampler has higher power than the blockers toughness because your trampler is destroyed
The cardboard backing of miniature packs is not graded
If you have items you want back in your hand, Tamatoa can fetch two of them from the discard when you play it
Like most Magic: The Gathering cards, the value of Gray Harbor Merfolk depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Commander Legends: Battle for Baldur's Gate)
These cards have their merits, especially if you prefer a more competitive approach to Commander, but if you find yourself conflicted about including them, its completely justifiable to keep playing what you enjoy instead