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The Demon synergy adds an extra layer of power, turning it into a life-drain engine if you can keep a Demon on the board

With that said, if you own a deck with any of these commanders, it's safe to say you've probably windmill slammed a virtual copy of Mox JasperMox Jasper into your decklist already, as you should

This is an incredibly complicated question to answer, as its subject to a variety of confounding factors, not the least of which is subjective bias on the part of human drafters

This lowers the casting cost of a spell by one mana for each artifact you control

A board wipe in a sword that you can reuse as long as you can re-equip it

On curve