This one provides excellent stats for a 2 drop and an effect near the power level of Shadowfiend so, nothing to be underestimated. Imagine this on turn 2 followed by Haunting Visions on turn 3. You might discover e.g. Hex and play it for free!
Does it even work with the three cards you mentioned? I think without the Discover Interface appearing, it's no longer a discover, but an "add" effect instead. Like how a Divine Shield Minion is no longer a Divine Shield Minion after it's bubble is popped, even though the text remains there.
Probably the strongest interactions this card can have currently in Standard, yet I don't feel you would ever waste a deck slot for it, lets say in Master's Call Hunter and ruin the chance of drawing all three.
Seems more likely for Druid's Crystalsong Portal only and that spell is not being used in zoo anyway. Finally, Warrior's current list can't afford to put this card