Lorwyn Eclipsed introduces mechanics that play on the theme of duality
It blows up a land for every copy, and with just a decent storm count, it leaves the entire table scrambling for mana
Turn death into advantage with Orah, Skyclave Hierophant
The following cards had printing errors, most of which were fixed in the Beta release
Second, it can make a silly number of tokens, and use them to either swarm opponents or clear problematic opposing creatures
You could also stand to change some of the dual lands since the shock lands are very expensive: Hallowed Fountain for Sejiri Refuge Watery Grave for Waterfront District Godless Shrine for Scoured Barrens Raffine's Tower for Obscura Storefront Inkmoth Nexus for Moorland Haunt Other Builds Alela, Artful Provocateur is a very flexible commander