The attack is really good and I am sure it will be situationally useful, but I would be weary about using any attack that opens you up to an X Ball Knock Out for 2 Prizes if you havent already taken 2 Prizes with that Pokmon
Border, text area, background elements, set patterning, all that starts to shimmer when you tilt it
You can trade single cards or multiples, and list the specific cards youre looking for in exchange
As such it is absolutely the better of the two at the front end
Otherwise I would keep Shiftry on the bench and move it in when you and your opponent have the same number of cards then I would use Conform and do damage and confuse the defending Pokemon
Its first triggered ability doesnt really seem to stack up against even the better strong casual Izzet commanders like Veyran, Voice of Duality, but the second tap ability is a monster