Chart shows the price of Cloud, Midgar Mercenary #10 at the end of each month going back as long as we have tracked the item.
This means that not only are you getting the usual lore everytime you quest with this card but youre also getting the opportunity to look at, and rearrange, the top three cards of your deck too
These will transform after you fulfill some kind of condition on the card, usually either an activated ability (i.e., paying to exile Terra, Magical Adept) or triggered ability (i.e., having six permanents in the yard for Exdeath, Void Warlock at end of turn)
Door Of Destinies Door of Destinies is a staple of any deck that primarily plays one creature type
It's never dominated any other format it's been legal in and I've not seen this dominant Vintage, Legacy, or Commander deck where this was too abusive