Ugin, The Spirit Dragon The most costly MTG planeswalker on this list, Ugin, The Spirit Dragon comes with plenty of loyalty and some extremely powerful effects that make them well worth the cost
(7/1/2012) If the card has X in its mana cost, you must choose 0 as its value.
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But in general, running out of spells is the best way to lose at Limited so, as odd as it sounds, I would regard Clattering Augur, Echoing Return, Gilt-Blade Prowler and Greed as perhaps the most indispensable cards for this archetype if you arent splashing
For example, if you put Necrodominance onto the battlefield and then put Spellbook (an artifact that says you have no maximum hand size) onto the battlefield, you would have no maximum hand size