Resist (color): The creature takes half damage from sources of that color, round down.
"Resist" is not cumulative with itself, either you have Resistance vs. a source, or you do not.
Vulnerable (color): The creature takes double damage from sources of that color.
"Vulnerable" is not cumulative with itself, either you have Vulnerability vs. a source, or you do not.
If you have Resist and Vulnerable to a source, they cancel.
Double Threshold: You have double threshold if you have at least 14 cards in your graveyard.