Electrozoa 

Creature — Jellyfish
$0.15 #26232 0.00 2.2 years
Flash
Flying
When this creature enters, you get 
(two energy counters).
At the beginning of your first main phase, tap this creature unless you pay
.
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Cards similar to Electrozoa 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.
Lathnu Hellion94%
$0.13↓#272870.009.9 years↑
"At the beginning of your end step, sacrifice this creature unless you pay 
."
+1 more matching line
Greenbelt Rampager86%
$0.34↑#17148↑0.33↑9.6 years↑
"When this creature enters, pay 
. If you can't, return this creature to its owner's hand and you get
."
Static Prison85%
$0.25↑#7097↑0.46↑2.2 years
"At the beginning of your first main phase, sacrifice this enchantment unless you pay
."
+1 more matching line
Hightide Hermit85%
$0.08↓#225810.50↑9.9 years↑
"Pay 
: This creature can attack this turn as though it didn't have defender."
+1 more matching line
Maulfist Doorbuster84%
$0.08↓#263350.31↑9.9 years↑
"Whenever this creature attacks, you may pay
. If you do, target creature can't block this turn."
+1 more matching line
Aethertide Whale84%
$0.08↓#8634↑0.31↑9.6 years↑
"Pay 


: Return this creature to its owner's hand."
+1 more matching line
Longtusk Cub84%
$0.17↑#20802↑0.079.9 years↑
"Pay 
: Put a +1/+1 counter on this creature."
+1 more matching line
Shipwreck Moray84%
$0.08↓#253210.079.6 years↑
"Pay
: This creature gets +2/-2 until end of turn."
+1 more matching line
Reservoir Walker84%
$0.08↓#235510.25↑9.6 years↑
"When this creature enters, you gain 3 life and get 

."
Scurry of Gremlins83%
$0.15#12884↑0.062.2 years
"When this enchantment enters, create two 1/1 red Gremlin creature tokens. Then you get an amount of
equal to the number of creatures you control."
Shielded Aether Thief82%
$0.29↑#19121↑0.62↑9.6 years↑
"Whenever this creature blocks, you get
."
+1 more matching line
Peema Aether-Seer82%
$0.15#12929↑0.009.6 years↑
"Pay 

: Target creature blocks this turn if able."
+1 more matching line
Woodweaver's Puzzleknot82%
$0.08↓#20450↑0.21↑9.9 years↑
"When this artifact enters, you gain 3 life and get 

."