Esior, Wardwing Familiar 
Legendary Creature — Bird
$0.54 #3438 0.44 5.9 years
Flying
Spells your opponents cast that target one or more commanders you control cost 
more to cast.
more to cast.Partner (You can have two commanders if both have partner.)
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Cards similar to Esior, Wardwing Familiar 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.
Boreal Elemental88%
$0.18↓#29307↓0.00↓7.3 years↑
"Spells your opponents cast that target this creature cost 
more to cast."
more to cast."
Sphinx of New Prahv88%
$0.18↓#24374↓0.33↓7.7 years↑
"Spells your opponents cast that target this creature cost more to cast."
more to cast."
Anara, Wolvid Familiar84%
$0.74↑#40600.22↓5.9 years
"Partner"
Icefall Regent82%
$0.42↓#13327↓0.83↑11.6 years↑
"Spells your opponents cast that target this creature cost more to cast."
more to cast."+1 more matching line
Falthis, Shadowcat Familiar81%
$0.34↓#7094↓0.82↑5.9 years
"Partner"
Rograkh, Son of Rohgahh80%
$1.91↑#2371↑0.95↑5.9 years
"Partner"
Syr Elenora, the Discerning80%
$0.11↓#14382↓0.27↓7.0 years↑
"Spells your opponents cast that target this card cost more to cast."
more to cast."
Jubilant Skybonder80%
$0.18↓#6176↓0.33↓6.5 years
"Creatures you control with flying have "Spells your opponents cast that target this creature cost more to cast.""
more to cast.""
Elderwood Scion78%
$0.27↓#23834↓0.00↓14.4 years↑
"Spells your opponents cast that target this creature cost more to cast."
more to cast."
Jeska, Thrice Reborn78%
$5.57↑#4678↓0.355.9 years
"Partner"
Charix, the Raging Isle78%
$0.38↓#37030.18↓6.1 years
"Spells your opponents cast that target this card cost more to cast."
more to cast."
Reyhan, Last of the Abzan78%
$14.60↑#6427↓0.21↓9.9 years↑
"Partner"
Pursued Whale77%
$0.22↓#16753↓0.15↓6.3 years
"Spells your opponents cast that target this creature cost more to cast."
more to cast."+1 more matching line
Slurrk, All-Ingesting77%
$0.29↓#9684↓0.11↓5.9 years
"Partner"
Eligeth, Crossroads Augur76%
$0.31↓#11544↓0.415.9 years
"Partner"
Kasmina, Enigmatic Mentor75%
$0.23↓#6351↓0.507.5 years↑
"Spells your opponents cast that target a creature or planeswalker you control cost more to cast."
more to cast."
Callaphe, Beloved of the Sea74%
$0.22↓#7775↓0.13↓6.7 years
"Creatures and enchantments you control have "Spells your opponents cast that target this permanent cost more to cast.""
more to cast.""
Alharu, Solemn Ritualist74%
$0.12↓#15106↓0.00↓5.9 years
"Partner"
Siani, Eye of the Storm74%
$0.28↓#14948↓0.00↓5.9 years
"Partner"
Kopala, Warden of Waves73%
$0.35↓#4211↓0.419.1 years↑
"Spells your opponents cast that target a Merfolk you control cost more to cast."
more to cast."