Goblin Ringleader 

Creature — Goblin
$0.53 #4350 0.27 25.3 years
Haste (This creature can attack and
as soon as it comes under your control.)
When this creature enters, reveal the top four cards of your library. Put all Goblin cards revealed this way into your hand and the rest on the bottom of your library in any order.
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Cards similar to Goblin Ringleader 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.
Muxus, Goblin Grandee86%
$11.19↑#39810.59↑6.1 years↓
"When this card enters, reveal the top six cards of your library. Put all Goblin creature cards with mana value 5 or less from among them onto the battlefield and the rest on the bottom of your library in a random order."
Grub's Command80%
$0.31↓#12741↓0.00↓0.6 years↓
"• Target player mills five cards, then puts each Goblin card milled this way into their hand."
Eclipsed Boggart75%
$0.24↓#11817↓0.00↓0.6 years↓
"When this creature enters, look at the top four cards of your library. You may reveal a Goblin, Swamp, or Mountain card from among them and put it into your hand. Put the rest on the bottom of your library in a random order."
Auntie's Hovel74%
$7.94↑#10489↓0.13↓18.9 years↓
"As this land enters, you may reveal a Goblin card from your hand. If you don't, this land enters tapped."
Boneclub Berserker72%
$0.20↓#12942↓0.00↓0.6 years↓
"This creature gets +2/+0 for each other Goblin you control."
Raven Familiar70%
$0.22↓#23695↓0.2727.6 years↑
"When this creature enters, look at the top three cards of your library. Put one of them into your hand and the rest on the bottom of your library in any order."