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Description
Whenever Sazh Katzroy attacks, put a +1/+1 counter on target creature, then double the number of +1/+1 counters on that creature

The Ur-Dragon loves this, but so does Syr Gwyn who only needs one turn to scoop up an assortment of pointy things and end a player
Sword of Truth and Justice When equipped to a creature, Sword of Truth and Justice gives that card +2/+2 and protection from white and blue

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This means that when paired with other horrors, Umbris is able to gradually erase an opponent's deck while growing Umbris itself into a massive threat