This might be just what warlock needed. Finally a high value minion. At 6 it might be too slow, but depending on what you discarded earlier, this might lead to insane value plays. Naturally, it might be more a fit for mid-range warlock with soulfire and doomguard than a full-blown discard lock tho. Depends on how successful you can manipulate what you discard. Has potential to be a better Faceless Summoner.
Enables slower Discard builds, easily. Just like Malcezaar's Imp negated discard's card advantage downside, this turns losing high-value resources into a strength. Spiritsinger Umbra might see play in this kind of deck.