Wazmoore, Zelgriem's Apostle

Deathtouch, infect
When Wazmoore, Zelgriem's Apostle enters the battlefield, you may sacrifice a creature. If you
do, you may cast creature spells from all
graveyards until the end of turn. You may spend
mana as though it were mana of any color to cast
these spells.
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"They are the perverters of nature, the
unspeakables."