The Ancient One A two-mana 8/8 Its very hard to say anything about The Ancient One other than the fact that its a two-mana blue and black 8/8, but were going to do so anyway
Urza, Lord High Artificer always fits well into an artifact deck
Then, when he turned it in, it became apparent the design would make a good Ob Nixilis
Basically every Deadpool deck that you can find online is chock full of cards like Conjurers Closet and Helm of the Host
Wizards is probably aware that they made a mistake when they gave us precise odds for serialized cards, as in Lord of the Rings, because that let us know what the total number in circulation was, a data point that they havent really replicated
Normally, this means during your main phase when the stack is empty, although flash may change this