I like Clues, but I wish it was an instant, even if it had to cost 2U, or 1UU or look at three cards instead of four (I'd much rather have Forbidden Alchemy, and it even has flashback), and I guess the common cycle could be useful in limited.
Firstblade looks worse than Skyknight Legionnaire because I'd guess evasion will be better in a format with high-toughness creatures than hitting for four on the card's first swing, but it still is a decent boros common.
Catch/Release sounds boring. Catch doesn't even feel very izzet, even if it could be considered powerful in some occasions, and Release is so overcosted it doesn't even begin to make sense, and it does look like it could've stood its own as a standalone card at 3WR rather than wedging it together with Catch. Paying 9 to make your opponent sacrifice some permanents plus her best one doesn't sound too thrilling...
Just figured out what's going on with the DGM shockland distribution.. They have two print sheets. That was the trick to make their math work. It's two 121 card sheets, with a combined 2x Maze's End, 1x 10 Shocklands and 23x Guildgates.
Wait. If each sheet has 121 cards, then I'd say each one gets 1 Maze's End, 5 shocklands and 115 guildgates (23 of each), so the print run made out of two different sheets would contain 2 Maze's Ends, 10 shocklands an 230 guildgates (46 of each). I guess the chance of getting any given card would be:
Maze's End: 1/121 = 0.8264%
Any shockland: 5/121 = 4.1322%
A specific shockland: 1/242 = 0.4132%
Any guildgate: 115/121 = 95.0413%
A specific guildgate: 46/242 = 19.0083%