River Heralds' Boon 
Instant
$0.09 #25042 0.12 9.1 years
Put a +1/+1 counter on target creature and a +1/+1 counter on up to one target Merfolk.
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Cards similar to River Heralds' Boon expected a card that isn't here?
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Jade Bearer89%
$0.08↓#228270.25↑8.8 years
"When this creature enters, put a +1/+1 counter on another target Merfolk you control."
Jade Guardian86%
$0.23↑#257870.079.1 years
"When this creature enters, put a +1/+1 counter on target Merfolk you control."
Deeproot Elite86%
$0.27↑#5970↑0.38↑8.8 years
"Whenever another Merfolk you control enters, put a +1/+1 counter on target Merfolk you control."
Vineshaper Mystic82%
$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."
Wanderwine Hub76%
$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."
Shaper Apprentice72%
$0.13↑#237470.079.1 years
"This creature has flying as long as you control another Merfolk."
Swift Warden72%
$0.17↑#213170.058.8 years
"When this creature enters, target Merfolk you control gains hexproof until end of turn."
Namor, Scourge of the Seas71%
$0.89↑#17874↑0.39↑0.3 years↓
"Each other Merfolk you control with a +1/+1 counter on it has flying."
Deeproot Waters70%
$0.26↑#4413↑0.30↑9.1 years
"Whenever you cast a Merfolk spell, create a 1/1 blue Merfolk creature token with hexproof."
Kumena's Speaker70%
$0.21↑#223570.00↓9.1 years
"This creature gets +1/+1 as long as you control another Merfolk or an Island."
River Sneak70%
$0.24↑#13811↑0.00↓9.1 years
"Whenever another Merfolk you control enters, this creature gets +1/+1 until end of turn."