Geode Golem 
Artifact Creature — Golem
$0.27 #3173 0.36 8.1 years
Trample
Whenever this creature deals combat damage to a player, you may cast your commander from the command zone without paying its mana cost. (You still pay any additional costs.)
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Cards similar to Geode Golem 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.
Maelstrom Archangel91%
$0.89↑#6522↓0.4217.6 years↑
"Whenever this creature deals combat damage to a player, you may cast a spell from your hand without paying its mana cost."
Loyal Guardian81%
$0.21↓#30070.15↓8.1 years
"Trample"
Evercoat Ursine79%
$0.41↑#5154↓0.00↓2.1 years↓
"Whenever this creature deals combat damage to a player, if there are cards exiled with it, you may play one of them without paying its mana cost."
+1 more matching line
Dreadhorde Arcanist79%
$0.39↑#7975↓0.11↓7.3 years
"Trample"
Master of Predicaments76%
$0.37↑#11483↓0.3112.1 years↑
"Whenever this creature deals combat damage to a player, choose a card in your hand. That player guesses whether the card's mana value is greater than 4. If the player guessed wrong, you may cast the card without paying its mana cost."
The Infamous Cruelclaw76%
$1.38↑#5153↓0.71↑2.1 years↓
"Whenever this card deals combat damage to a player, exile cards from the top of your library until you exile a nonland card. You may cast that card by discarding a card rather than paying its mana cost."
Smuggler's Buggy76%
$1.42↑#10234↓0.56↑4.4 years↓
"Whenever this Vehicle deals combat damage to a player, you may cast the exiled card without paying its mana cost. If you do, return this Vehicle to its owner's hand."
Malcolm, Alluring Scoundrel76%
$2.74↑#1555↑0.332.8 years↓
"Whenever this card deals combat damage to a player, put a chorus counter on it. Draw a card, then discard a card. If there are four or more chorus counters on this card, you may cast the discarded card without paying its mana cost."
Renegade Bull74%
$0.19↓#14356↓0.00↓0.4 years↓
"Trample"
Demon of Wailing Agonies72%
$1.76↑#14650↓0.62↑11.8 years↑
"As long as you control your commander, this creature gets +2/+2 and has "Whenever this creature deals combat damage to a player, that player sacrifices a creature of their choice.""
Deadly Rollick72%
$26.56↑#107↑1.46↑6.4 years↓
"If you control a commander, you may cast this spell without paying its mana cost."
Gargadon71%
$0.08↓#17909↓0.47↑5.2 years↓
"Trample"
Deflecting Swat70%
$64.66↑#75↑1.72↑6.4 years↓
"If you control a commander, you may cast this spell without paying its mana cost."
Yuan-Ti Fang-Blade70%
$0.17↓#13493↓0.275.1 years↓
"Whenever this creature deals combat damage to a player, venture into the dungeon."
Shortcut Seeker70%
$0.20↓#15776↓0.17↓5.1 years↓
"Whenever this creature deals combat damage to a player, venture into the dungeon."
Caves of Chaos Adventurer70%
$0.34↑#7589↓0.284.2 years↓
"Trample"
Cadira, Caller of the Small70%
$0.18↓#3819↓0.17↓4.2 years↓
"Trample"