Is it still against the rules to prey upon people that don't see the market trends? Long story short I just got played like a fool on Jace, Vyrn's when they went from $20 to $65 in less than a month. Dropped 2 and a Liliana for a Mind Sculptor and. Long story short feeling awfully cheated here just because I don't follow the standard markets that much.
There is no rules against this as I know and I honestly dont think there should be. Each trader is responsible for evaluating their own cards and to figure out if their own trade is fair.
Also I looked at your trades, the trade you are referring too was finished September 8th..... this is looooong before the major spike we see now. I honestly think you are mad at yourself for making the trade after seeing the new price of Jace even though at the time I bet you were pretty happy with the trade.