Q: Whose discard pile does it end up in? The naïve reading of the card suggests that it goes in the discard pile of the person who played A Chance Encounter, but I know better than to be so naïve!
The reason I ask: is ACE a way that William Yorrick can use another player's ally as the card describes, discard it to WY's discard pile, for it to be 'dug' up to play again using his special ability?