What you have to realize about Fading Signals is that it basically reads "Remove target player's library from the game". Sure, a few cards might be lucky enough to escape, but you've basically spent 3UU to kill your opponent. The drawback on something like that SHOULD be absolutely enormous. Remember Apocalypse? That's the kind of thing I'm thinking about, except Apocalypse wishes it was this good. This would be fair: Fading Signals (3UU) Sorcery Look at target player's library. You may remove any cards in that player's library that share a name with another card in that player's library. For each card you remove from that player's library in this way, that player may look at your library and choose a card. Remove cards chosen in this way from the game. Mercury Elemental is broken. It's just that simple. Sure, you can Disenchant or Stone Rain it...but (A) that means you aren't using those utility cards on their intended targets, and (B) you have to be playing the appropriate cards to even use its effect. Add 1 to the casting cost and it's fair.