I think maybe the David Copperfield of the DCU was maybe Zatanna's dad...although in the 52 Verse Bruce claimed Zee is "unstable" in Justice League Dark. I kind of think that implies her skills aren't as refined as they were in the regular DCU.
That's still in my too read pile.
But... They probably dated, so Bruce saying she's unstable has more to do with a four hour argument about leaving the toilet seat up rather than that she's on the verge of becoming evil.
"YOU CAN FLY! YOU'RE NOT GOING TO FALL IN!"