Stonybrook Banneret 

Creature — Merfolk Wizard
$0.25 #3062 0.27 18.6 years
Islandwalk (This creature can't be blocked as long as defending player controls an Island.)
Merfolk spells and Wizard spells you cast cost
less to cast.
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Cards similar to Stonybrook Banneret 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.
Kopala, Warden of Waves73%
$0.28↑#4150↓0.318.9 years↓
"Abilities your opponents activate that target a Merfolk you control cost
more to activate."
The Destined Warrior73%
$1.93↑#13143↓0.00↓0.8 years↓
"Cleric, Rogue, Warrior, and Wizard spells you cast cost
less to cast."
Brighthearth Banneret72%
$1.88↑#6324↓0.42↑18.6 years
"Elemental spells and Warrior spells you cast cost
less to cast."
Frogtosser Banneret72%
$0.31↑#7063↓0.1818.6 years
"Goblin spells and Rogue spells you cast cost
less to cast."
+1 more matching line
Wanderwine Hub72%
$0.83↑#13800↓0.05↓18.9 years
"As this land enters, you may reveal a Merfolk card from your hand. If you don't, this land enters tapped."
Arcane Epiphany71%
$0.22↓#11327↓0.14↓1.8 years↓
"This spell costs
less to cast if you control a Wizard."
Silvergill Mentor70%
$0.22↓#16344↓0.00↓0.6 years↓
"As an additional cost to cast this spell, behold a Merfolk or pay
."
Silvergill Adept70%
$0.24↓#12701↓0.00↓18.9 years
"As an additional cost to cast this spell, reveal a Merfolk card from your hand or pay
."
Bosk Banneret70%
$0.39↑#9819↓0.47↑18.6 years
"Treefolk spells and Shaman spells you cast cost
less to cast."
Wizard's Retort70%
$0.30↑#4672↓0.40↑8.4 years↓
"This spell costs
less to cast if you control a Wizard."
Jade Bearer70%
$0.06↓#22477↓0.258.6 years↓
"When this creature enters, put a +1/+1 counter on another target Merfolk you control."