Cyrus' Subterfuge

You enchant a small vial of scented oil with powerful magic.  When the enchanted item is crushed, the scented oil fills the air and dissipates any magical residue left behind from the casting of spells such as Teleport and Scrying. This becomes particularly effective when you are attempting to hide your trail from arcane sniffers. 

This spell is geared more towards the role playing aspects of spell casters leaving an arcane signature within the spells they weave and are able to be identified thusly. If your group does not follow this type of thinking or role playing, then do not consider this spell.