Hollowmurk Siege 

Enchantment
$0.92 #3067 0.24 1.5 years
As this enchantment enters, choose Sultai or Abzan.
• Sultai — Whenever a counter is put on a creature you control, draw a card. This ability triggers only once each turn.
• Abzan — Whenever you attack, put a +1/+1 counter on target attacking creature. It gains menace until end of turn.
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Cards similar to Hollowmurk Siege expected a card that isn't here?
Reports become test cases the matcher is graded against before an update ships. Delvefall isn't a chatbot guessing, it compares the printed rules text of every card with plain math, and examples like yours decide which differences should count.
Danny Pink91%
$20.02↑#27120.55↑3.0 years↑
"Creatures you control have "Whenever one or more counters are put on this creature for the first time each turn, draw a card.""
Metropolis Angel85%
$0.21↓#17503↓0.00↓4.5 years↑
"Whenever you attack with one or more creatures with counters on them, draw a card."
Battlesong Berserker82%
$0.17↓#20830↓0.191.9 years
"Whenever you attack, target creature you control gets +1/+0 and gains menace until end of turn."
Tributary Instructor82%
$0.25↓#8547↓0.00↓2.9 years↑
"Whenever a creature you control with a +1/+1 counter on it dies, draw a card."
Mikey & Leo, Chaos & Order79%
$1.37↑#7069↓0.230.6 years
"Whenever you put a counter on a creature you control, draw a card. This ability triggers only once each turn."
Dusk Legion Duelist78%
$1.63↑#27030.11↓3.5 years↑
"Whenever one or more +1/+1 counters are put on this creature, draw a card. This ability triggers only once each turn."
Primal Empathy78%
$0.20↓#7994↓0.246.5 years↑
"At the beginning of your upkeep, draw a card if you control a creature with the greatest power among creatures on the battlefield. Otherwise, put a +1/+1 counter on a creature you control."
Military Intelligence78%
$0.25↓#6450↓0.06↓12.3 years↑
"Whenever you attack with two or more creatures, draw a card."
Armasaur Guide76%
$0.09↓#17861↓0.06↓1.9 years
"Whenever you attack with three or more creatures, put a +1/+1 counter on target creature you control."
Generous Patron76%
$0.41↓#33250.07↓8.4 years↑
"Whenever you put one or more counters on a creature you don't control, draw a card."
Exemplar of Light76%
$0.91↓#1124↑0.321.9 years
"Whenever you put one or more +1/+1 counters on this creature, draw a card. This ability triggers only once each turn."
Pensive Professor75%
$0.38↓#5323↓0.180.5 years↓
"Whenever one or more +1/+1 counters are put on this creature, draw a card."
Item Shopkeep75%
$0.15↓#13617↓0.251.4 years
"Whenever you attack, target attacking equipped creature gains menace until end of turn."
Smelted Chargebug75%
$0.12↓#18865↓0.192.3 years
"Whenever this creature attacks, you may pay
. If you do, another target attacking creature gets +1/+0 and gains menace until end of turn."
Fathom Mage74%
$0.26↓#1712↑0.2413.7 years↑
"Whenever a +1/+1 counter is put on this creature, you may draw a card."
Haliya, Ascendant Cadet74%
$0.25↓#9247↓0.12↓1.2 years
"Whenever one or more creatures you control with +1/+1 counters on them deal combat damage to a player, draw a card."
+1 more matching line
Meltstrider Eulogist74%
$0.27↓#7975↓0.11↓1.2 years
"Whenever a creature you control with a +1/+1 counter on it dies, draw a card."
Shaile, Dean of Radiance // Embrose, Dean of Shadow74%
$0.30↓#11866↓0.00↓5.5 years↑
"Whenever a creature you control with a +1/+1 counter on it dies, draw a card."
Inquisitorial Rosette74%
$2.90↑#7054↓0.184.0 years↑
"Whenever equipped creature attacks, create a 2/2 white Astartes Warrior creature token with vigilance that's attacking. Then attacking creatures gain menace until end of turn."