Like the idea. This card would kill against incarnate.
Make it absorb
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for each undead creature on the feild and redice the costs to 5
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and 4
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(6 seems slightly high for such a feeble creature)
Only one potential abuse stragatgy: Fractal graves + pandemonium.
Edit: why not make the graves be 0|3 and enter the game poisoned? That way it'd have a "penatly."