Implementation request: WHO secret lair

[Cytocide]

There are a number of mechanically unique cards added in one of the Doctor Who secret lairs: https://scryfall.com/search?order=set&q=e%3Asld+cn%E2%89%A51580+cn%E2%89%A41584&unique=prints

These were not listed in the WHO set implementation thread so perhaps they should be added there or added as a new implementation tracker.

[DominionSpy]

Development discussion

Most of the cards in this drop seem fairly straightforward, however [[The Celestial Toymaker]] implies that guesses and making piles of cards are events that can be watched, which they are not currently in XMage.

Implementing this card would require introducing two new event types and changing the implementations of the following cards, presumably to use specific choose method variants: Guess cards Pile cards

[github-actions[bot]]

The Celestial Toymaker - (Gatherer) (Scryfall) (EDHREC)

{W}{U}{B} Legendary Creature — Rogue Artificer 2/4 Whenever The Celestial Toymaker attacks, look at the top three cards of your library. Exile any number of them in a face-down pile and the rest in a face-up pile. Defending player chooses one of those piles. Put that pile into your hand. At the beginning of each end step, each opponent loses 2 life for each spell or ability that caused one or more players to guess or to group cards or permanents into a pile this turn.

[xenohedron]

Rose Noble, The Meep, The Fourteenth Doctor implemented now