With all of these mana sinks, it's very unlikely that you'll ever have mana unspent
Due to how common it is for creatures to die in the format, Morbid can trigger almost every turn, even if you do not have a way to trigger it on your own
Pairing Cori-Steel Cutter with cheap spells lets your board scale explosively
Lavinia, Azorius Renegade strikes fear on another level, so if you can get ahead on lands, opponents will be able to play fewer cards, plus there's a good chance one of their alternate casting options gets countered
Like most Magic: The Gathering cards, the value of Dragonlord Ojutai depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Pioneer Masters)
Sevinne's damage prevention ability also allows him to block with impunity, giving your opponents no reason to swing at you with their creature unless it has trample