Forerunner of the Heralds 
Creature — Merfolk Scout
$0.36 #9416 0.37 8.6 years
When this creature enters, you may search your library for a Merfolk card, reveal it, then shuffle and put that card on top.
Whenever another Merfolk you control enters, put a +1/+1 counter on this creature.
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Cards similar to Forerunner of the Heralds expected a card that isn't here?
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Merrow Harbinger99%
$2.86↑#92380.07↓18.9 years↑
"When this creature enters, you may search your library for a Merfolk card, reveal it, then shuffle and put that card on top."
Deeproot Elite84%
$0.28↓#5868↑0.24↓8.6 years
"Whenever another Merfolk you control enters, put a +1/+1 counter on target Merfolk you control."
Jade Bearer79%
$0.06↓#22477↓0.25↓8.6 years
"When this creature enters, put a +1/+1 counter on another target Merfolk you control."
Seahunter79%
$3.62↑#11379↓0.48↑26.6 years↑
", 
: Search your library for a Merfolk permanent card, put it onto the battlefield, then shuffle."
, : Search your library for a Merfolk permanent card, put it onto the battlefield, then shuffle."
Jade Guardian78%
$0.17↓#25347↓0.65↑8.9 years
"When this creature enters, put a +1/+1 counter on target Merfolk you control."
River Sneak78%
$0.21↓#13661↓0.418.9 years
"Whenever another Merfolk you control enters, this creature gets +1/+1 until end of turn."
Wanderwine Hub76%
$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."
Vineshaper Mystic70%
$0.16↓#23659↓0.21↓8.9 years
"When this creature enters, put a +1/+1 counter on each of up to two target Merfolk you control."