Assassin`s Coin

You imbue a coin with a magical charm that allows it to return to you.

As an action, someone can throw the coin into the air while speaking your name (or whatever name you gave them) and the coin will vanish.

If you are on the same plane of existence the coin will reappear in your pocket, along with a mental image of whoever spoke your name. If you are not on the same plane of existence the coin eds up somewhere in the astral sea.

No message can be transferred along with the coin.

At Higher Levels. 

When you cast this spell using 5-level or higher spell slot, when the coin reappears you also receive a mental image of the surroundings 30-ft radius of the person sending the coin. 

When you cast this spell using 7-level or higher spell slot you can receive the coin form any plane of existence.