Goblin Firebug 
Creature — Goblin
$0.08 #28597 0.47 23.6 years
When this creature leaves the battlefield, sacrifice a land.
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Cards similar to Goblin Firebug 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.
Phyrexian War Beast92%
$0.15↑#288170.00↓30.2 years↑
"When this creature leaves the battlefield, sacrifice a land and this creature deals 1 damage to you."
Molten Man, Inferno Incarnate88%
$0.16↑#13538↑0.30↓1.0 years↓
"When this card leaves the battlefield, sacrifice a land."
Alpine Guide84%
$0.25↑#19128↑0.00↓7.2 years↓
"When this creature leaves the battlefield, sacrifice a Mountain."
Dance of Many80%
$0.49↑#16222↑0.00↓32.1 years↑
"When the token leaves the battlefield, sacrifice this enchantment."
Servant of Volrath78%
$0.06↓#308400.00↓28.9 years↑
"When this creature leaves the battlefield, sacrifice a creature."
Featherbrained Filcher78%
$0.17↑#21519↑0.00↓0.5 years↓
"When this creature leaves the battlefield, create a Food token."
City Pigeon78%
$0.19↑#13325↑0.511.0 years↓
"When this creature leaves the battlefield, create a Food token."
Scythe Tiger76%
$0.13↑#267070.25↓16.9 years↓
"When this creature enters, sacrifice it unless you sacrifice a land."
Delusions of Mediocrity76%
$1.67↑#14029↑0.00↓27.6 years↑
"When this enchantment leaves the battlefield, you lose 10 life."
Foul Spirit76%
$0.61↑#316250.06↓28.2 years↑
"When this creature enters, sacrifice a land."
Soul Scourge76%
$0.16↑#305730.00↓24.6 years
"When this creature leaves the battlefield, that player gains 3 life."
Circuit Mender76%
$0.17↑#2194↑0.08↓4.5 years↓
"When this creature leaves the battlefield, draw a card."
Papercraft Decoy76%
$0.20↑#15954↑0.00↓4.5 years↓
"When this creature leaves the battlefield, you may pay 
. If you do, draw a card."
. If you do, draw a card."
Tyrannical Pitlord74%
$0.15↑#20609↑0.00↓4.0 years↓
"When this creature leaves the battlefield, sacrifice the chosen creature."
Raze73%
$0.82↑#21144↑0.5627.9 years↑
"As an additional cost to cast this spell, sacrifice a land."
Devastating Summons73%
$0.28↑#21286↑0.25↓16.4 years↓
"As an additional cost to cast this spell, sacrifice X lands."
Walker of the Grove72%
$0.05↓#21622↑0.00↓18.6 years↓
"When this creature leaves the battlefield, create a 4/4 green Elemental creature token."
Thragtusk72%
$0.26↑#8212↑0.05↓14.1 years↓
"When this creature leaves the battlefield, create a 3/3 green Beast creature token."
Momo, Playful Pet72%
$0.35↑#8874↑0.00↓0.8 years↓
"When this card leaves the battlefield, choose one —"
Cosmic Larva71%
$0.36↑#19553↑0.29↓22.3 years↓
"At the beginning of your upkeep, sacrifice this creature unless you sacrifice two lands."