I prefer Erebos instead of greed, it only cost one more mana to do the same ability and don't allow your opponents earn life, also you get an indestructible creature card if divinity of pride enters the battlefield
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I belive you can use some Izzet Guild gates, in case you want some cheap dual lands that are always useful, izzet key rune may work too... and I'll add some gutter snipes. Good deck, I like it