Another notable negative is the fact that its pre-evolution is incredibly weak
Vulturous Aven doesnt read super impressively, but its combination of a high value Exploit spell, flying, and decent stats made it arguably the strongest common black creature in Dragons of Tarkir
Additionally, charging Scorching Fang to its fullest potential meant discarding more Fire energies, another factor that had to be built around in decks
Bouncing back to your hand isn't as bad as sacrificing a creature, but the effect still sets you back in a big way and can be followed up with a nasty counterspell
I'll likely include Worn Powerstone and Thran Dynamo before Hedron Archive, so there might not be room
Presumably this means that lots of canny fans correctly predicted that an old, weird card like this wasn't going to see a reprint, and would be worth snatching up sooner rather than later