Black Market? Well hell no! People can just easily farm mounts already, but this is a pain for everyone who already did.
Now every shitty nub can get a rare mount by just having the gold. Really, not good.
Getting TCG mounts on there is good, making them obtainable ingame finally, instead of by doing outgame actions, but the rare drops should stay rare drops.
This is an insult to all of us collectors who did quite some effort to obtain our mount collections.