With how often I draw cards, I would be annoyed using that macro. To be honest I have had some people know they have cards on em and even commented. Had a blackmage go crazy cus his cast time was...forgive me if this is wrong on speed but I think he said it was 1.74 with enhanced arrow + Ley lines. However Arrow, Spire, Ewer they may not know the card is activated but they will know they have extra TP/MP/ or are attacking faster.