If a spell or ability an opponent controls causes you to discard Obstinate Baloth, and both Obstinate Baloth's ability and another ability (such as that of an opponent's Leyline of the Void) instruct you to put Obstinate Baloth somewhere else instead of putting it into your graveyard, you choose which one to apply
In terms of playability, it didn't stand out much in Standard at the time, and only its GX attack was interesting
Though she prefers the living to the dead (the living, after all, can pay her), she does have hard lines that can be crossed
Create a Sorcerer Role token attached to up to one other target creature you control
Basically Sol Ring plus Ancestral Recall
And since you only need one of each card, it's much cheaper and easier to find that one copy of a card you want to add to your deck