Demonic Covenant

Mana cost: {4}{B}{B}
Type: Kindred Enchantment — Demon
Set: Duskmourn: House of Horror Commander #49 (rare)
Price: $0.45 USD

Whenever one or more Demons you control attack a player, you draw a card and lose 1 life.
At the beginning of your end step, create a 5/5 black Demon creature token with flying, then mill two cards. If two cards that share all their card types were milled this way, sacrifice this enchantment.

Demonic Covenant has 2 printings, first in Duskmourn: House of Horror Commander (2024). EDHREC ranks it #8,459 among Commander cards. It appears most in Winter, Cynical Opportunist decks (3,778 on EDHREC). 1 public deck on TCG runs it. It has 4 official rulings.

Legality

commander: legal
legacy: legal
vintage: legal
pauper: not legal
modern: not legal
pioneer: not legal
standard: not legal
brawl: not legal

Public decks that run Demonic Covenant

Death Toll - Duskmourn: House of Horror Commander, led by Winter, Cynical Opportunist

Commanders that run Demonic Covenant most

Deck counts from EDHREC.

Winter, Cynical Opportunist: 3,778 decks
Be'lakor, the Dark Master: 2,557 decks
Ardyn, the Usurper: 2,002 decks
Raphael, Fiendish Savior: 589 decks
Winter, Misanthropic Guide: 458 decks
Valgavoth, Terror Eater: 231 decks
The Speed Demon: 143 decks
Jerren, Corrupted Bishop // Ormendahl, the Corrupter: 141 decks

Often played with Demonic Covenant

Cards that show up in the same decks on EDHREC.

Rulings

2024-09-20: Demonic Covenant's first ability will trigger once for each player you attack with one or more Demons.
2024-09-20: The card types in Magic include artifact, battle, creature, enchantment, instant, kindred, land, planeswalker, and sorcery. Legendary, basic, and snow are supertypes, not card types; Horror and Room are subtypes, not card types.
2024-09-20: Demonic Covenant's last ability will only cause you to sacrifice Demonic Covenant if both cards have the exact same combination of card types. Supertypes and subtypes are not taken into account.
2024-09-20: Creatures that enter attacking are never declared as attackers, and as such, they won't cause Demonic Covenant's first ability to trigger.