Azkadi, Lich Knight of Varix

Menace, first strike, vigilance
Whenever a creature you control dies, you can
exile an instant or sorcery card from your hand
face down. You may look at and cast that card
for as long as it remains exiled, and you may pay
life equal to its converted mana cost rather than
pay its mana cost.
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Death and vengeance itself.