Warning: boring discussion of rules semantics ahead. đ¤
The text on Evasion Sigil is
QuoteBefore a creature fights, discard the top card of its controller's deck. If the discarded card is of the active house, exhaust that creature with no effect.
That seems easy to understand, but does it also affect defending creatures? That is, creatures targeted by an attacking creature. The glossary entry under Fight reads:
QuoteWhen a player uses a creature to fight , the player exhausts the creature and chooses an opponentâs creature. Both creatures deal an amount of damage equal to their power value to the opposing creature in the fight , and both are â fight ingâ for the purposes of card effects.
(emphasis mine)
So under the rules as written both creatures "are fighting". Does the defending creature trigger Evasion Sigil? Technically I think it does, but I don't think it is supposed to. If the intent was for only the attacking creature to trigger Evasion Sigil then maybe it should read "Before a creature is used to fight ..." Am I wrong in my interpretation of the card or the rules?