Ishai, Ojutai Dragonspeaker 
Legendary Creature — Bird Monk
$3.68 #4727 0.56 9.9 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%
$0.41↓#956↑0.38↓18.7 years↑
"Whenever an opponent casts a spell, you may put a +1/+1 counter on this creature."
Managorger Hydra95%
$0.36↓#1022↑0.4811.3 years↑
"Whenever a player casts a spell, put a +1/+1 counter on this creature."
Sunscorch Regent93%
$0.31↓#1629↑0.36↓11.6 years↑
"Whenever an opponent casts a spell, put a +1/+1 counter on this creature and you gain 1 life."
Thundering Mightmare90%
$0.42↓#11160↓0.28↓4.9 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%
$0.61↓#10864↓0.11↓28.3 years↑
"Whenever an opponent casts a creature spell, put a +1/+1 counter on enchanted creature."
Mold Adder86%
$0.12↓#14685↓0.20↓17.3 years↑
"Whenever an opponent casts a blue or black spell, you may put a +1/+1 counter on this creature."
Forgotten Ancient85%
$0.34↓#390↑0.44↓23.4 years↑
"Whenever a player casts a spell, you may put a +1/+1 counter on this creature."
Witchstalker85%
$0.29↓#19155↓0.00↓13.3 years↑
"Whenever an opponent casts a blue or black spell during your turn, put a +1/+1 counter on this creature."
Medusa, Inhuman Queen84%
$0.27↓#17923↓0.43↓0.3 years↓
"Whenever a player casts a noncreature spell, put a +1/+1 counter on this card."
Akiri, Line-Slinger84%
$4.24↑#10177↓0.13↓9.9 years
"Partner"
Ludevic, Necro-Alchemist84%
$1.32↓#14174↓0.20↓9.9 years
"Partner"
Citanul Druid84%
$8.33↑#28629↓0.21↓32.6 years↑
"Whenever an opponent casts an artifact spell, put a +1/+1 counter on this creature."
Ravos, Soultender84%
$10.63↑#9629↓0.33↓9.9 years
"Partner"
Titania's Chosen83%
$0.27↓#17453↓0.06↓28.0 years↑
"Whenever a player casts a green spell, put a +1/+1 counter on this creature."
Kydele, Chosen of Kruphix82%
$2.54↓#12648↓0.539.9 years
"Partner"
Steelburr Champion82%
$0.37↓#7006↓0.26↓2.2 years↓
"Whenever an opponent casts a noncreature spell, put a +1/+1 counter on this creature."
Kraum, Ludevic's Opus81%
$2.58↓#7032↓0.25↓9.9 years
"Whenever an opponent casts their second spell each turn, draw a card."
+1 more matching line
Reyhan, Last of the Abzan81%
$14.60↑#6427↓0.21↓9.9 years
"Partner"
Silas Renn, Seeker Adept81%
$2.01↓#12298↓0.35↓9.9 years
"Partner"
Ikra Shidiqi, the Usurper81%
$0.39↓#3702↑0.39↓9.9 years
"Partner"