Khanvor's Guardian

when Khanvor's Guardian enters the battlefield,
cast a instant ou sorcery costing 3 or less from
your graveyard without paying the mana cost,
then exile it.
Addendum—If you cast this spell during your
main phase, copy that conjured speel from
your graveyard.
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I'll show Khanvor he can count on me, I'll be his
right hand, fist of the storm.