I'm still looking for a Modest/Timid Sigilyph with Magic Guard.
Been searching for four days now and I'm getting fed up.
Maybe you can use a Synchronizer with something with False Swipe. At least you have a higher chance of getting a Timid/Modest Sigilyph while False Swiping can tell you exactly if Sigilyph has Magic Guard (Sandstorm damage).