Enchantment — Aura

Enchant creature
As Chromatic Armor enters the battlefield, choose a color.
Chromatic Armor enters the battlefield with a sleight counter on it.
Prevent all damage that would be dealt to enchanted creature by sources of the last chosen color.
: Put a sleight counter on Chromatic Armor and choose a color. X is the number of sleight counters on Chromatic Armor.