I just came across this card today, and I found it to be very interesting.
Drafna's Restoration
Color= Blue Type= Sorcery Cost= U AQ(C4)
Text (AQ+errata): Return any number of target artifact cards from target player's graveyard to the top of his or her library in any order. [Oracle 1999/09/03]
For the cost of U, return any number of artifact cards from a graveyard to the top of the library. I'm thinking of this card from two different angles. First, is there any way to break this with one form of combo or another? And second, as hate against welder decks for example. Protect your artifacts from being welded, or prevent them from welding their own big creatures into play and stack their deck in the bargain. Thoughts?
Note: Mods, please feel free to move/lock this if you feel that this thread does not belong in the open forum, I just wanted to bring this card to everybody's attention.