Ishai, Ojutai Dragonspeaker 
Legendary Creature — Bird Monk
$3.29 #4668 0.59 9.8 years
Flying
Whenever an opponent casts a spell, put a +1/+1 counter on Ishai.
Partner (You can have two commanders if both have partner.)
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Cards similar to Ishai, Ojutai Dragonspeaker 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.
Taurean Mauler97%
$0.56↓#947↑0.31↓18.6 years↑
"Whenever an opponent casts a spell, you may put a +1/+1 counter on this creature."
Managorger Hydra95%
$0.99↓#997↑0.48↓11.1 years↑
"Whenever a player casts a spell, put a +1/+1 counter on this creature."
Sunscorch Regent93%
$0.30↓#1686↑0.29↓11.4 years↑
"Whenever an opponent casts a spell, put a +1/+1 counter on this creature and you gain 1 life."
+1 more matching line
Thundering Mightmare90%
$0.39↓#10837↓0.33↓4.8 years↓
"As long as this card is paired with another creature, each of those creatures has "Whenever an opponent casts a spell, put a +1/+1 counter on this creature.""
+1 more matching line
Predatory Hunger88%
$0.65↓#10710↓0.00↓28.2 years↑
"Whenever an opponent casts a creature spell, put a +1/+1 counter on enchanted creature."
Medusa, Inhuman Queen86%
$0.27↓#18977↓0.00↓0.2 years↓
"Whenever a player casts a noncreature spell, put a +1/+1 counter on this card."
Mold Adder86%
$0.11↓#14542↓0.00↓17.1 years↑
"Whenever an opponent casts a blue or black spell, you may put a +1/+1 counter on this creature."
Witchstalker86%
$0.25↓#19122↓0.27↓13.1 years↑
"Whenever an opponent casts a blue or black spell during your turn, put a +1/+1 counter on this creature."
Forgotten Ancient85%
$0.38↓#390↑0.37↓23.3 years↑
"Whenever a player casts a spell, you may put a +1/+1 counter on this creature."
Akiri, Line-Slinger85%
$4.38↑#9975↓0.41↓9.8 years
"Partner"
Ludevic, Necro-Alchemist84%
$1.37↓#13901↓0.24↓9.8 years
"Partner"
Citanul Druid84%
$8.63↑#28175↓0.5332.5 years↑
"Whenever an opponent casts an artifact spell, put a +1/+1 counter on this creature."
Titania's Chosen84%
$0.31↓#17141↓0.06↓27.9 years↑
"Whenever a player casts a green spell, put a +1/+1 counter on this creature."
Ravos, Soultender84%
$10.83↑#9518↓0.36↓9.8 years
"Partner"
+1 more matching line
Steelburr Champion82%
$0.28↓#6838↓0.24↓2.1 years↓
"Whenever an opponent casts a noncreature spell, put a +1/+1 counter on this creature."
Kydele, Chosen of Kruphix82%
$2.22↓#12401↓0.47↓9.8 years
"Partner"
Bruse Tarl, Boorish Herder82%
$1.79↓#7384↓0.45↓9.8 years
"Partner"
Kraum, Ludevic's Opus81%
$3.09↓#6911↓0.679.8 years
"Whenever an opponent casts their second spell each turn, draw a card."
+1 more matching line
Ikra Shidiqi, the Usurper81%
$0.42↓#3725↑0.30↓9.8 years
"Partner"
Reyhan, Last of the Abzan81%
$15.74↑#6293↓0.619.8 years
"Partner"