At the end of your turn, you may flip Heads, I Win.
During your opponent’s turn, after your opponent plays a creature adjacent to a creature of the same house, fulfill Heads, I Win.
P07
Artist: Ilham Zaka
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During your opponent’s turn, after your opponent plays a creature adjacent to a creature of the same house, fulfill Heads, I Win.
The second ability of Heads, I Win will fulfill during the opponent's turn after playing a creature adjacent to a card that matches the played creature's house. If the existing card in the battleline belongs to 1 or more houses that the played card also belongs to, Heads is fulfilled. The prophecy fulfills at the same time as other "after play" effects resolve, which is after any bonus icons on the played creature resolve.