At 5:48, I agree that diamond can be a mythic based on defense and combos. You can have Angel v4 + diamond + lei for a defensive build. You can use sanguine and soul guitar for a full defense.
On Minecraft, my cousin found a random chest with two shields, and it was a 0.0000001 percent chance, and we found a buried treasure map, and the treasure had two stacks of diamonds inside of it, and that was a 0.000001 presents chance