This is an interesting and completely different take on the "Linking Rings" plot, that leaves the spectators with an odd souvenir. Union contains two effects: Black Union and White Union.

Black Union - you are able to cause the scorch marks on two different cards to link on a single card.
-Both cards can be signed, and handed out immediately after.
-Three versions are taught.

White Union - this is the inverse of Black Union, in that the rings are white, rather than black. You cause a white ring to vanish from one card, and appear linked with a white ring on another card.
-Again, both cards can be signed and handed out afterwards.
-There is nothing to add or take away.
-An additional presentation idea is taught, that will give your audience a memory to cherish.