Esior, Wardwing Familiar 
Legendary Creature — Bird
$0.64 #3368 0.35 5.8 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.
Sphinx of New Prahv88%
$0.09↓#25291↓0.10↓7.6 years↑
"Spells your opponents cast that target this creature cost 
more to cast."
more to cast."
Boreal Elemental88%
$0.18↓#28962↓0.277.2 years↑
"Spells your opponents cast that target this creature cost more to cast."
more to cast."
Anara, Wolvid Familiar86%
$0.79↑#4065↓0.275.8 years
"Partner"
Jubilant Skybonder84%
$0.16↓#6099↓0.13↓6.4 years
"Creatures you control with flying have "Spells your opponents cast that target this creature cost more to cast.""
more to cast.""
Falthis, Shadowcat Familiar84%
$0.32↓#7008↓0.295.8 years
"Partner"
Icefall Regent82%
$0.47↓#12998↓0.65↑11.4 years↑
"Spells your opponents cast that target this creature cost more to cast."
more to cast."
Syr Elenora, the Discerning80%
$0.11↓#14125↓0.00↓6.9 years↑
"Spells your opponents cast that target this card cost more to cast."
more to cast."
Rograkh, Son of Rohgahh80%
$1.83↑#2355↑0.66↑5.8 years
"Partner"
Callaphe, Beloved of the Sea79%
$0.20↓#7502↓0.22↓6.6 years
"Creatures and enchantments you control have "Spells your opponents cast that target this permanent cost more to cast.""
more to cast.""
Charix, the Raging Isle78%
$0.44↓#36560.24↓5.9 years
"Spells your opponents cast that target this card cost more to cast."
more to cast."
Elderwood Scion78%
$0.24↓#23415↓0.4214.3 years↑
"Spells your opponents cast that target this creature cost more to cast."
more to cast."
Monastery Siege78%
$0.68↑#5943↓0.46↑11.6 years↑
"• Dragons — Spells your opponents cast that target you or a permanent you control cost more to cast."
more to cast."
Jeska, Thrice Reborn78%
$6.15↑#4513↓0.385.8 years
"Partner"
Pursued Whale78%
$0.22↓#16408↓0.386.2 years
"Spells your opponents cast that target this creature cost more to cast."
more to cast."+1 more matching line
Reyhan, Last of the Abzan78%
$15.74↑#6293↓0.61↑9.8 years↑
"Partner"
Loyal Drake78%
$0.29↓#5203↓0.23↓8.1 years↑
"Flying"
Kopala, Warden of Waves77%
$0.28↓#4150↓0.318.9 years↑
"Spells your opponents cast that target a Merfolk you control cost more to cast."
more to cast."
Slurrk, All-Ingesting76%
$0.29↓#9671↓0.415.8 years
"Partner"
Kasmina, Enigmatic Mentor76%
$0.23↓#6668↓0.48↑7.3 years↑
"Spells your opponents cast that target a creature or planeswalker you control cost more to cast."
more to cast."
Eligeth, Crossroads Augur76%
$0.32↓#11895↓0.46↑5.8 years
"Partner"