Singer of Swift Rivers 
Creature — Merfolk Shaman
$0.30 #6034 0.26 2.8 years
Flash
When this creature enters, put a shield counter on another target creature you control. (If it would be dealt damage or destroyed, remove a shield counter from it instead.)
You may cast Merfolk spells as though they had flash.
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Cards similar to Singer of Swift Rivers 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.
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"Put a shield counter on each of up to three target creatures."
Crashing Tide75%
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"This spell has flash as long as you control a Merfolk."
Silvergill Adept75%
$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 
."
."
Perrie, the Pulverizer74%
$0.25↓#16442↓0.40↑4.4 years↑
"When this card enters, put a shield counter on target creature."
Wanderwine Hub74%
$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."
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"Prevent all damage that would be dealt to creatures you control by sources you control."
Boon of Safety74%
$0.32↑#7261↓0.314.4 years↑
"Put a shield counter on target creature."
High Fae Trickster74%
$4.67↑#870↑0.37↑1.8 years
"You may cast spells as though they had flash."
Emperor Mihail II73%
$0.33↑#4202↑0.284.0 years↑
"You may cast Merfolk spells from the top of your library."
Brokers Veteran72%
$0.22↓#21816↓0.254.4 years↑
"When this creature dies, put a shield counter on target creature you control."
Deeproot Waters72%
$0.26↓#4363↑0.37↑8.9 years↑
"Whenever you cast a Merfolk spell, create a 1/1 blue Merfolk creature token with hexproof."
Shielded Passage72%
$0.04↓#21108↓0.3613.6 years↑
"Prevent all damage that would be dealt to target creature this turn."
Shield Broker72%
$0.19↓#10450↓0.40↑4.4 years↑
"When this creature enters, put a shield counter on target noncommander creature you don't control. You gain control of that creature for as long as it has a shield counter on it."
Silvergill Mentor72%
$0.22↓#16344↓0.00↓0.6 years↓
"As an additional cost to cast this spell, behold a Merfolk or pay 
."
."
Gatta and Luzzu70%
$0.25↓#56180.261.2 years↓
"When this card enters, choose target creature you control. If damage would be dealt to that creature this turn, prevent that damage and put that many +1/+1 counters on it."
+1 more matching line
Leyline of Anticipation70%
$3.40↑#735↑0.56↑16.1 years↑
"You may cast spells as though they had flash."
Jade Bearer70%
$0.06↓#22477↓0.258.6 years↑
"When this creature enters, put a +1/+1 counter on another target Merfolk you control."