Lavacore Elemental 
Creature — Elemental
$0.14 #27309 0.29 19.6 years
Vanishing 1 (This creature enters with a time counter on it. At the beginning of your upkeep, remove a time counter from it. When the last is removed, sacrifice it.)
Whenever a creature you control deals combat damage to a player, put a time counter on this creature.
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Cards similar to Lavacore Elemental 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.
Waning Wurm91%
$0.25↑#18858↑0.2919.6 years
"Vanishing 2"
Calciderm90%
$0.06↓#296850.2519.6 years
"Vanishing 4"
Yuan-Ti Fang-Blade86%
$0.17↑#13493↑0.275.1 years↓
"Whenever this creature deals combat damage to a player, venture into the dungeon."
Shortcut Seeker86%
$0.20↑#15776↑0.17↓5.1 years↓
"Whenever this creature deals combat damage to a player, venture into the dungeon."
Soultether Golem81%
$0.33↑#269930.00↓19.3 years
"Vanishing 1"
+1 more matching line
Precinct Captain80%
$0.24↑#11137↑0.2513.9 years↓
"Whenever this creature deals combat damage to a player, create a 1/1 white Soldier creature token."
Ravaging Riftwurm77%
$0.24↑#20363↑0.2719.3 years
"Vanishing 2"
Four Knocks76%
$0.77↑#8802↑0.67↑2.9 years↓
"Vanishing 4"
Lightning Reaver76%
$0.58↑#20342↑0.71↑17.3 years↓
"Whenever this creature deals combat damage to a player, put a charge counter on it."
Vorosh, the Hunter76%
$0.73↑#19588↑0.41↑19.6 years
"Whenever this card deals combat damage to a player, you may pay 
. If you do, put six +1/+1 counters on this card."
. If you do, put six +1/+1 counters on this card."
Prowler, Misguided Mentor74%
$0.35↑#20364↑0.280.9 years↓
"Whenever this card deals combat damage to a player, put a +1/+1 counter on another target creature you control."
Diseased Vermin72%
$0.34↑#236090.07↓30.2 years↑
"Whenever this creature deals combat damage to a player, put an infection counter on it."
Thrummingbird72%
$0.25↑#845↑0.2215.9 years↓
"Whenever this creature deals combat damage to a player, proliferate."
Infesting Radroach72%
$2.20↑#5018↑0.202.5 years↓
"Whenever this creature deals combat damage to a player, they get that many rad counters."
Bloodcrazed Neonate72%
$0.09↓#226300.17↓14.9 years↓
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Coiling Stalker71%
$0.13↓#18927↑0.41↑4.5 years↓
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on target creature you control that doesn't have a +1/+1 counter on it."
Eager Trufflesnout71%
$0.23↑#14087↑0.11↓1.8 years↓
"Whenever this creature deals combat damage to a player, create a Food token."
Scream Puff71%
$0.14#15451↑0.243.0 years↓
"Whenever this creature deals combat damage to a player, create a Food token."
Vexing Radgull70%
$1.39↑#4734↑0.212.5 years↓
"Whenever this creature deals combat damage to a player, that player gets two rad counters if they don't have any rad counters. Otherwise, proliferate."
Glowing One70%
$2.30↑#4524↑0.54↑2.5 years↓
"Whenever this creature deals combat damage to a player, they get four rad counters."