If Knight of Doves leaves the battlefield while it has an Aura you control attached to it or at the same time as another creature with an Aura you control attached to it, its ability won't trigger for those enchantments unless they were destroyed by the same effect that caused Knight of Doves to leave the battlefield
Looking at feedback can be helpful and you should avoid sellers with a lot of bad feedback, but high feedback is not always accurate
At the bottom they also have some extra lore about the card
First up, flexibility in the mana base is fantastic in EDH and Magic in general
If you get it right, theres money to be made, with even outsiders to the game picking up Reserved Lists cards as part of their portfolio
Frasier adds that they have a lovely bromance occurring throughout the set, and Casey is the only person/card to make Raphael seem reasonable by comparison