That also keeps other characters from questing the rest of the turn too, so you just have to weigh your options when figuring out the best approach on any given turn
A mana rock that is always on, cant be interacted with, and helps you cast your creatures is enormously powerful, especially when those creatures are generally the most powerful things on the board
Malakir Bloodwitch I own a few foils from before VOW was printed, and I bought in at much too high a price
Remember that they're treated as permanents on the battlefield while in combat, so a graveyard creature attacking will cause anything that triggers when a creature attacks (including its own abilities) to trigger
Order Ravnica: City of Guilds now
Hitting him for less than his toughness multiple times won't work, as he'll just keep healing