(This was created as context for Challenge # 037.)

I don't actually see what this contributes to the deck. I'm no tournament player, but I can't see why a blue-black control deck would want to do this. Aren't you hoping you'll have stuffed their graveyard with all the stuff you've countered, killed, or made them discard? I mean, sure, Time Warp is good, but I can't see why the control player would want the rest of this effect.

Because you've got your "board sweeper and kept swept" combo on the board; but your opponent broke it, or you need your killer demon back to actually swing for the win...

Or you just did the "Everyone sacrifices n things" trick, and want your n back whilst they chose to lose some land since you already bounced everything else.

It's belt and braces, I'd say. I don't see it as the backbone; I agree.

If we really want to hose this, though; I propose: "Whenever an opponent would take an additional turn, instead, you do."

Not really Core Set material, I'd think... although I'd have thought that about Sundial of the Infinite too until it happened.

But no, we don't really need to hose this particular card. It's not the primary strategy of the Boney Control deck.

It's true, this card is more "Too powerful for its casting cost" than one of the broken pieces of this deck. When making Boney Control, I was looking for holes to fill, and one of them was "No real staying power for the long game". Boney Control actually has problems against a real control deck, ala "The Deck" which only wants to draw cards and counter creatures. That deck would counter All the World as well, but, if it failed to, or if you were playing against a Wrath of God type deck, this thing would cut them to ribbons.