I am pretty new to vintage, and magic in general, and played in a vintage tourney with Oath the other day.  I had played with it very little before the event, which became evident turn 2, game 1 round 1.  I don't know what my opponent is playing and keep a hand with Wasteland, Jet, Oath, Orchard, Brainstorm, Thoughtseize, Chalice.
My opponent opens with Delta for Bayou and Duresses me, taking the oath and passes the turn.  I draw a Ruby for the turn and play Jet, thoughtseize revealing Delta, Recall, Confidant, Goyf, Goyf.  Awesome, BUG fish.  I take the Recall, waste the Bayou and pass the turn back.  We play draw, go for a few turns and all I draw is another Orchard, another Chalice and Hellkite.  About turn 4 My board is Chalice for 0, Mox, mox, Orchard, orchard just waiting for him to rip the second source and then bound way ahead with his bob, so I drop Chalice for 2.  In Oath.  Wow.  As soon as I do it I realize I really have no way to win short of hardcasting and Angel or dragon, or wipe away on my own chalice.  Awesome.  He proceeds to drop his second land, followed by a curse catcher and beats me to death with the tokens and the catcher.  He tells me after the game that he ended up with 4 goyfs, drawing them turns 2 and 3.
As I finish that game a friend also playing Oath walks up and tells me I won;t believe how bad he punted his match, but im sure i got him beat and tell him my sob story.  Apparently he messed up worse and scooped twice to Painters servant/grindstone.  Playing Oath.  With maindeck  blessing.  Wow.

What about Channel to one, play the Mirror, then crack a fetch.  You die from the activation, the mirror resets the board and then you get to fetch a land, right?  so the game resets, plus you have a land and the Channel mana.  Worth considering? Not as good as Bargain, but easier to pull off.