Mindleech Mass 
Creature — Horror
$0.40 #7350 0.24 20.9 years
Trample
Whenever this creature deals combat damage to a player, you may look at that player's hand. If you do, you may cast a spell from among those cards without paying its mana cost.
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Cards similar to Mindleech Mass 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.
Silent-Blade Oni96%
$5.36↑#2844↑0.52↑14.3 years↓
"Whenever this creature deals combat damage to a player, look at that player's hand. You may cast a spell from among those cards without paying its mana cost."
Etali, Primal Conqueror // Etali, Primal Sickness80%
$25.50↑#799↑1.65↑3.4 years↓
"Trample"
Maelstrom Archangel78%
$0.89↑#65220.42↑17.6 years↓
"Whenever this creature deals combat damage to a player, you may cast a spell from your hand without paying its mana cost."
Mindclaw Shaman78%
$0.29↓#11570↓0.08↓14.1 years↓
"When this creature enters, target opponent reveals their hand. You may cast an instant or sorcery spell from among those cards without paying its mana cost."
Armada Wurm77%
$0.38↓#13841↓0.00↓13.9 years↓
"Trample"
Extract Brain76%
$0.29↓#84930.39↑5.1 years↓
"Target opponent chooses X cards from their hand. Look at those cards. You may cast a spell from among them without paying its mana cost."
Dreadhorde Arcanist75%
$0.39↓#79750.11↓7.3 years↓
"Trample"
Deus of Calamity73%
$0.33↓#19226↓0.3018.3 years↓
"Trample"
Kheru Mind-Eater72%
$0.69↑#16840↓0.269.0 years↓
"Whenever this creature deals combat damage to a player, that player exiles a card from their hand face down."
Gleancrawler72%
$0.36↓#17080↓0.41↑20.9 years
"Trample"
Ghastlord of Fugue71%
$1.27↑#19561↓0.46↑18.3 years↓
"Whenever this creature deals combat damage to a player, that player reveals their hand. You choose a card from it. That player exiles that card."
Doomgape71%
$0.22↓#19356↓0.2818.1 years↓
"Trample"
Renegade Bull70%
$0.19↓#14356↓0.00↓0.4 years↓
"Trample"
Thundering Tanadon70%
$0.17↓#26534↓0.00↓15.3 years↓
"Trample"
Reversal of Fortune70%
$3.75↑#21041↓0.45↑22.3 years↑
"Target opponent reveals their hand. You may copy an instant or sorcery card in it. If you do, you may cast the copy without paying its mana cost."
Caves of Chaos Adventurer70%
$0.34↓#75890.284.2 years↓
"Trample"