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Once each turn, whenever you cast a nonlegendary creature spell with flying you get to copy it, except the copy is a 1/1 Spirit in addition to its other types

I could see that you rather want to play Case of the Crimson Pulse in that slot, cause your hand empties rather quickly in this deck and with twelve haste creatures you can deal a lot of damage out of nowhere each turn you draw three

So why shouldn't they run it

He clearly pushes you most towards an Equipment-heavy playstyle, and thats probably how most will run him

Dare to enter the ever-changing plane of Lorwyn and Shadowmoor in Lorwyn Eclipsed

Whenever a spell is cast, a counter is traded out for a 2/2 black Zombie creature token