Demonic Covenant 
Kindred Enchantment — Demon
$0.31 #8314 0.29 2.1 years
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.
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Unholy Annex // Ritual Chamber81%
$1.47↑#2984↑0.18↓2.1 years
"At the beginning of your end step, draw a card. If you control a Demon, each opponent loses 2 life and you gain 2 life. Otherwise, you lose 2 life."
+1 more matching line
Moonglove Extractor78%
$0.11↓#14300↓0.02↓0.7 years↓
"Whenever this creature attacks, you draw a card and lose 1 life."
Audacious Thief78%
$0.08↓#95560.00↓7.3 years↑
"Whenever this creature attacks, you draw a card and you lose 1 life."
Coercive Impetus76%
$0.34↑#67180.13↓0.5 years↓
"Whenever enchanted creature attacks, you draw a card and lose 1 life."
Karazikar, the Eye Tyrant76%
$9.35↑#3866↑0.385.2 years↑
"Whenever an opponent attacks another one of your opponents, you and the attacking player each draw a card and lose 1 life."
Syr Gwyn, Hero of Ashvale74%
$2.87↑#11161↓0.11↓7.0 years↑
"Whenever an equipped creature you control attacks, you draw a card and you lose 1 life."
Takenuma Bleeder73%
$0.06↓#31098↓0.00↓21.7 years↑
"Whenever this creature attacks or blocks, you lose 1 life if you don't control a Demon."
Voltaic Whip73%
$0.27↓#22388↓0.02↓0.3 years↓
"Equipped creature gets +2/+0 and has "Whenever this creature attacks alone, you draw a card and lose 1 life.""
Baleful Force72%
$0.58↑#13848↓0.00↓13.0 years↑
"At the beginning of each upkeep, you draw a card and you lose 1 life."
Military Intelligence72%
$0.25↓#6450↑0.06↓12.3 years↑
"Whenever you attack with two or more creatures, draw a card."
The Chief Warg72%
$0.18↓#16778↓0.230.2 years↓
"Whenever you attack while you control a creature with power 4 or greater, you draw a card and lose 1 life."
Overwhelming Instinct71%
$0.16↓#13722↓0.06↓24.0 years↑
"Whenever you attack with three or more creatures, draw a card."
Chivalric Alliance70%
$13.73↑#3088↑0.203.5 years↑
"Whenever you attack with two or more creatures, draw a card."
Preacher of the Schism70%
$0.84↑#4721↑0.202.9 years
"Whenever this creature attacks while you have the most life or are tied for most life, you draw a card and you lose 1 life."
Metropolis Angel70%
$0.21↓#17503↓0.00↓4.5 years↑
"Whenever you attack with one or more creatures with counters on them, draw a card."
Firemane Commando70%
$0.42↑#1800↑0.05↓3.5 years↑
"Whenever you attack with two or more creatures, draw a card."
Elegy Acolyte70%
$0.45↑#5100↑0.00↓1.2 years
"Whenever one or more creatures you control deal combat damage to a player, you draw a card and lose 1 life."
Be'lakor, the Dark Master70%
$3.61↑#76500.12↓4.0 years↑
"When this card enters, you draw X cards and you lose X life, where X is the number of Demons you control."
Sokka, Lateral Strategist70%
$0.19↓#74550.15↓0.9 years↓
"Whenever this card and at least one other creature attack, draw a card."