Gold means a rare, and finally, if it is orange and red, its a mythic rare
You'll also know how many face-down conspiracies a player has in the command zone, although you won't know what they are
Replacement effects that care about damage from a red source don't apply to it
Its a simple but very effective ability, and you can upgrade it by making sure all of your bits are indestructible or currently being flickered out or whatever you want to do to make sure this never harms you or your stuff
The Base Set was made up of 102 cards, with 36 booster packs (each containing 11 cards) to a single sealed booster box
Blue in EOE predominantly cares about artifacts and card draw, with a healthy sprinkling of cards that utilize the new warp mechanic