Many cards in Innistrad: Midnight Sun use daybound and nightbound to see if they transform like on Brutal Cathar / Moonrage Brute
If you cast one spell, Clever Lumimancer attacks for the same as Soul-Scar Mage, but it scales better with each additional spell in the same turn, and this deck is definitely constructed in a way where you want to cast multiple spells in the same turn
Voltaic Key is one of those cards that makes broken things even more broken at a cost that you can't afford to pay unless you're abusing broken cards
We've got the cheap-ass creatures, so we use the targeted explosions
When the cards are fused, what was once an obvious choice of targeting yourself with Toil becomes a more interesting debate with Trouble, as Toil adds four extra points of damage to the player you target with Trouble
I guess its the little things (though there isnt really much little about this weirdo)