Whenever one or more creatures deal combat damage to you, each opponent sacrifices a creature of their choice that dealt combat damage to you this turn. The Ring tempts you.
Discard a card: Witch-king of Angmar gains indestructible until end of turn. Tap it.
Witch-king is a mono-black evasive threat that turns combat into a one-sided removal engine: opponents who attack you lose a creature, and you can discard cards to make him indestructible and survive blocks or board wipes. You play him as a recurring Ring-bearer beater while leaning on black's discard-as-resource synergies, then close games with reanimation, evasive damage, or a combo finish.
Cheap, evasive 5-mana commander with built-in indestructibility that survives most board wipes and combat
Punishes opponents for attacking you, deterring early aggression and protecting your life total
Discard-to-protect cost fuels graveyard and madness/discard payoff synergies
The Ring temptation gives free card advantage, evasion, and protection over time
Mono-black access to the best tutors, ramp, and reanimation in the format
The sacrifice trigger only fires when creatures hit YOU, so it's irrelevant against noncreature decks or when you're not attacked
Discarding cards for indestructibility drains your hand and can be a real resource cost
Mono-black struggles with enchantments and resilient artifacts
No inherent way to force opponents to attack you, making the marquee ability inconsistent
Single-color decks lack the explosive interaction of multicolor builds
A reliable mono-black finisher that drains the table based on your heavy black pip count.
Add fast mana (Dark Ritual, Jet Medallion, Mana Vault) and premium tutors (Demonic Tutor, Vampiric Tutor) to assemble your engine faster and more consistently. Lean into reanimation and discard payoffs so the indestructibility cost generates value rather than just bleeding cards, and include 'forced attack' or goad effects plus deterrents like No Mercy and Dictate of Erebos to maximize the sacrifice trigger. Round out with a compact combo line (Mikaeus + a sacrifice loop or Bolas's Citadel + Aetherflux) so you have a reliable closer when grinding stalls.