Goblin War Wagon is awful.
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Rod of Ruin is useless.
I considered that, but it would destroy all of my equipment and lands (aside from darksteel citadel). It would stall the game but most of the indestructible creatures don't have very high attack so it wouldn't be much of an opportunity to win unless your opponent has very few life left; it's more of a last resort... I had a worldslayer in this deck for a while but never ended up using it. It may go back in at some point, though, because it's an annoying card :D