At the end of your opponent’s turn, if they have 
in their pool equal to or greater than the current key cost, fulfill Signs Point to Yes.
in their pool equal to or greater than the current key cost, fulfill Signs Point to Yes.P12
Artist: Tony Cromo
Commentary
"At the end of your opponent's turn" is in the "end of turn" effects window, similar to Fangtooth Cavern or Curse of Cowardice.
Source: Prophecies and Their Timing
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