There is a channel on youtube called Tolarian Community College that has some good tips for new players. Here is a link to his tips for new players video; https://youtu.be/f2inKfgKL_c
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The core of Trainwreck is just the Urborg, Coffers and Staff of Domination. What you do with all that incremental value afterwards is up to the person piloting the deck. At the time it was popular, Helldozer was simply the best thing to play and generate more value by denying your opponent resources. Nowadays there are things like Grave Titan or Walking Ballista, but at this point it's a fringe deck at best.
Deadly Dispute seems good in a deck like this.
Why is it a shame?
I could certainly try it.
Why didn't you just respond to the comment on your deck?
Typically I only get to play edh once or twice a month, so I don't play the decks enough to get bored of them.Zada is linear and reliant on the commander sticking around. However, usually when I cast Zada I already have a good enough board presence that I can go off. I can usually fight through a couple of removal spells. Sometimes I want to turn the brain off and play dudes and spells.