This can be a pretty great deal in drawn-out games, particularly given that the majority of the games removal can be found in its Action cards
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You can also cage Nevinyrral's Disk and Soul of New Phyrexia / Aetherling to wipe the board on demand, or just equip him with Darksteel Plate to make sure he survives
With a reliable way to repeatedly bring Ashen Rider into play, you can quickly start removing every permanent under your opponent's control, lands included
Queen Marchesa is a 3/3 Legendary Human Assassin that costs one generic, one Red, one White, and one Black mana, and has the Deathtouch and Haste mechanics
Its another big creature that you can cast for 4 mana with Satoru Umezawa, though other decks like Braids, Conjurer Adept can cheat it into play to give you a big, evasive threat with shroud