Hollowmurk Siege 

Enchantment
$0.91 #3179 0.26 1.4 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%
$18.66↑#27690.262.9 years↑
"Creatures you control have "Whenever one or more counters are put on this creature for the first time each turn, draw a card.""
Battlesong Berserker88%
$0.17↓#20681↓0.07↓1.8 years
"Whenever you attack, target creature you control gets +1/+0 and gains menace until end of turn."
Metropolis Angel85%
$0.21↓#17340↓0.00↓4.4 years↑
"Whenever you attack with one or more creatures with counters on them, draw a card."
Tributary Instructor82%
$0.24↓#8340↓0.14↓2.8 years↑
"Whenever a creature you control with a +1/+1 counter on it dies, draw a card."
Mikey & Leo, Chaos & Order79%
$1.20↑#7527↓0.00↓0.5 years
"Whenever you put a counter on a creature you control, draw a card. This ability triggers only once each turn."
Dusk Legion Duelist78%
$1.80↑#27360.193.4 years↑
"Whenever one or more +1/+1 counters are put on this creature, draw a card. This ability triggers only once each turn."
Armasaur Guide78%
$0.17↓#17748↓0.05↓1.8 years
"Whenever you attack with three or more creatures, put a +1/+1 counter on target creature you control."
Primal Empathy78%
$0.24↓#7769↓0.11↓6.4 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%
$0.27↓#6308↓0.15↓12.1 years↑
"Whenever you attack with two or more creatures, draw a card."
Item Shopkeep78%
$0.09↓#13680↓0.221.2 years
"Whenever you attack, target attacking equipped creature gains menace until end of turn."
Generous Patron76%
$0.69↓#33700.218.2 years↑
"Whenever you put one or more counters on a creature you don't control, draw a card."
Exemplar of Light76%
$0.75↓#1245↑0.311.8 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%
$0.37↓#6367↓0.00↓0.4 years↓
"Whenever one or more +1/+1 counters are put on this creature, draw a card."
Haliya, Ascendant Cadet75%
$0.21↓#9401↓0.281.1 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
Smelted Chargebug75%
$0.12↓#18565↓0.00↓2.2 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↓#1716↑0.2613.6 years↑
"Whenever a +1/+1 counter is put on this creature, you may draw a card."
Shaile, Dean of Radiance // Embrose, Dean of Shadow74%
$0.33↓#11543↓0.00↓5.4 years↑
"Whenever a creature you control with a +1/+1 counter on it dies, draw a card."
Meltstrider Eulogist74%
$0.27↓#8243↓0.09↓1.1 years
"Whenever a creature you control with a +1/+1 counter on it dies, draw a card."
Tribute to the World Tree74%
$13.68↑#604↑0.42↑3.4 years↑
"Whenever a creature you control enters, draw a card if its power is 3 or greater. Otherwise, put two +1/+1 counters on it."