Genesis Hydra 
Creature — Plant Hydra
$0.38 #2706 0.25 12.3 years
When you cast this spell, reveal the top X cards of your library. You may put a nonland permanent card with mana value X or less from among them onto the battlefield. Then shuffle the rest into your library.
This creature enters with X +1/+1 counters on it.
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Cards similar to Genesis Hydra 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.
Ajani, Outland Chaperone75%
$1.38↑#10506↓0.11↓0.7 years↓
"−8: Look at the top X cards of your library, where X is your life total. You may put any number of nonland permanent cards with mana value 3 or less from among them onto the battlefield. Then shuffle."
Ao, the Dawn Sky73%
$0.35↓#4398↓0.164.7 years↓
"• Look at the top seven cards of your library. Put any number of nonland permanent cards with total mana value 4 or less from among them onto the battlefield. Put the rest on the bottom of your library in a random order."
United Battlefront72%
$0.28↓#14224↓0.50↑1.5 years↓
"Look at the top seven cards of your library. Put up to two noncreature, nonland permanent cards with mana value 3 or less from among them onto the battlefield. Put the rest on the bottom of your library in a random order."
Knickknack Ouphe71%
$0.26↓#14740↓0.333.1 years↓
"When this creature enters, reveal the top X cards of your library. You may put any number of Aura cards with mana value X or less from among them onto the battlefield. Then put all cards revealed this way that weren't put onto the battlefield on the bottom of your library in a random order."
+1 more matching line
Ivy Elemental70%
$0.13↓#18381↓0.11↓25.1 years↑
"This creature enters with X +1/+1 counters on it."
Endless One70%
$0.59↑#6067↓0.00↓11.0 years↓
"This creature enters with X +1/+1 counters on it."
Faithful Watchdog70%
$0.19↓#8980↓0.00↓2.3 years↓
"This creature enters with three +1/+1 counters on it."
Adaptive Shimmerer70%
$0.10↓#23305↓0.226.5 years↓
"This creature enters with three +1/+1 counters on it."
Hatchery Spider70%
$0.37↓#11861↓0.06↓8.0 years↓
"When you cast this spell, reveal the top X cards of your library, where X is the number of creature cards in your graveyard. You may put a green permanent card with mana value X or less from among them onto the battlefield. Put the rest on the bottom of your library in a random order."