I just always get this vibe from TF.
You are either attacking quite slow and throwing out your slow moving Q's as AP.
Or you have high attack speed and are throwing out cards with multiple attack animations and a satisfying hit sound.
But the AD version just doesn't work. Could he get any changes towards being both AP and AD viable?
Make the attack speed buff scale with Bonus AD to a cap at each rank. This would also give him a good idea of what his "optimum" bonus AD would be.
Give red and gold card a rank-scaling bonus AD ratio, maybe with red scaling better than gold.
Maybe have wild cards give some AD utility. Like increasing crit damage on targets you hit with it. Or granting an attack reset.