Mindleech Mass 
Creature — Horror
$0.37 #7487 1.00 21.0 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%
$4.46↑#2939↑0.71↓14.4 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%
$26.11↑#813↑1.85↑3.5 years↓
"Trample"
Maelstrom Archangel78%
$0.78↑#65710.24↓17.7 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%
$0.27↓#11925↓0.80↓14.3 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%
$0.44↑#13934↓0.24↓14.0 years↓
"Trample"
Extract Brain76%
$0.28↓#86570.29↓5.2 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."
Reversal of Fortune74%
$4.15↑#21192↓0.39↓22.4 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."
Kheru Mind-Eater72%
$0.64↑#17159↓0.62↓9.2 years↓
"Whenever this creature deals combat damage to a player, that player exiles a card from their hand face down."
Gleancrawler72%
$0.35↓#17461↓0.39↓21.1 years
"Trample"
Ghastlord of Fugue71%
$1.29↑#19972↓0.35↓18.5 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."
Renegade Bull70%
$0.19↓#13875↓0.08↓0.5 years↓
"Trample"
Thundering Tanadon70%
$0.14↓#26839↓0.25↓15.4 years↓
"Trample"
Primalcrux70%
$5.25↑#19203↓0.31↓18.2 years↓
"Trample"