Swift Warden 
Creature — Merfolk Warrior
$0.17 #21317 0.05 8.8 years
Flash
When this creature enters, target Merfolk you control gains hexproof until end of turn. (It can't be the target of spells or abilities your opponents control.)
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Cards similar to Swift Warden 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.
Jade Bearer84%
$0.08↓#228270.25↑8.8 years
"When this creature enters, put a +1/+1 counter on another target Merfolk you control."
Plumecreed Escort83%
$0.26↑#4350↑0.002.2 years↓
"When this creature enters, target creature you control gains hexproof until end of turn."
+1 more matching line
Brilliant Wings82%
$24.50↑#8188↑0.34↑0.9 years↓
"Flash"
Jade Guardian82%
$0.23↑#25787↓0.079.1 years
"When this creature enters, put a +1/+1 counter on target Merfolk you control."
Wanderwine Hub81%
$0.82↑#13839↑0.0819.0 years↑
"As this land enters, you may reveal a Merfolk card from your hand. If you don't, this land enters tapped."
Spectacular Spider-Man81%
$5.08↑#3066↑0.29↑1.1 years↓
"Flash"
Deeproot Waters80%
$0.26↑#4413↑0.30↑9.1 years
"Whenever you cast a Merfolk spell, create a 1/1 blue Merfolk creature token with hexproof."
Deeproot Elite79%
$0.27↑#5970↑0.38↑8.8 years
"Whenever another Merfolk you control enters, put a +1/+1 counter on target Merfolk you control."
Void Grafter76%
$0.27↑#16382↑0.21↑10.7 years↑
"When this creature enters, another target creature you control gains hexproof until end of turn."
+1 more matching line
Foggy Nelson, On Retainer76%
$0.25↑#234610.130.3 years↓
"When this card enters, put a +1/+1 counter on another target creature you control. It gains hexproof until end of turn."
+1 more matching line
Vineshaper Mystic76%
$0.20↑#240980.28↑9.1 years
"When this creature enters, put a +1/+1 counter on each of up to two target Merfolk you control."
Chase Inspiration74%
$0.21↑#12569↑0.090.5 years↓
"Target creature you control gets +0/+3 and gains hexproof until end of turn."
Glint74%
$0.16↓#214570.0011.6 years↑
"Target creature you control gets +0/+3 and gains hexproof until end of turn."
Dive Down74%
$0.14↓#6519↑0.069.1 years
"Target creature you control gets +0/+3 and gains hexproof until end of turn."
Patriot, Shield Wielder74%
$0.13↓#177190.19↑0.3 years↓
"
, 
: Another target creature you control gets +2/+0 and gains hexproof until end of turn."
, : Another target creature you control gets +2/+0 and gains hexproof until end of turn."
The Wasp, Winsome Avenger74%
$0.19↑#14324↑0.31↑0.3 years↓
"When this card enters, target Hero gains hexproof until end of turn."
+1 more matching line
Fungal Fortitude74%
$0.27↑#5889↑0.112.9 years↓
"Flash"
Deeproot Pilgrimage74%
$1.82↑#4523↑0.26↑2.9 years↓
"Whenever one or more nontoken Merfolk you control become tapped, create a 1/1 blue Merfolk creature token with hexproof."
River Sneak74%
$0.24↑#13811↑0.009.1 years
"Whenever another Merfolk you control enters, this creature gets +1/+1 until end of turn."
Eel Umbra74%
$0.14↓#5789↑0.0516.5 years↑
"Flash"