Seal of Doom
Enchantment (CMC 3)
Sacrifice Seal of Doom: Destroy target nonblack creature. It can't be regenerated.
Decks with Seal of Doom
[MM3] Modern Masters 2017 #83 (U)
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[C15] Commander 2015 #135 (C)
[DIS] Dissension #53 (C)
[NEM] Nemesis #70 (C)
[MB1] Mystery Booster #765 (C)