Grenzo, Havoc Raiser 
Legendary Creature — Goblin Rogue
$0.28 #1641 0.35 10.0 years
Whenever a creature you control deals combat damage to a player, choose one —
• Goad target creature that player controls.
• Exile the top card of that player's library. Until end of turn, you may cast that card and you may spend mana as though it were mana of any color to cast that spell.
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Cards similar to Grenzo, Havoc Raiser 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.
Curse of Hospitality83%
$0.37↑#7965↓0.49↑4.8 years↓
"Whenever a creature deals combat damage to enchanted player, that player exiles the top card of their library. Until end of turn, that creature's controller may play that card and they may spend mana as though it were mana of any color to cast that spell."
Gonti, Night Minister82%
$0.79↑#2503↓0.48↑1.6 years↓
"Whenever a creature deals combat damage to one of your opponents, its controller looks at the top card of that opponent's library and exiles it face down. They may play that card for as long as it remains exiled. Mana of any type can be spent to cast a spell this way."
Stolen Strategy80%
$0.34↑#4563↓0.65↑8.2 years↓
"At the beginning of your upkeep, exile the top card of each opponent's library. Until end of turn, you may cast spells from among those exiled cards, and you may spend mana as though it were mana of any color to cast those spells."
Gonti, Canny Acquisitor80%
$1.57↑#8111↓0.59↑2.4 years↓
"Whenever one or more creatures you control deal combat damage to a player, look at the top card of that player's library, then exile it face down. You may play that card for as long as it remains exiled, and mana of any type can be spent to cast that spell."
You Find Some Prisoners80%
$0.18↓#4434↓0.21↓5.1 years↓
"• Interrogate Them — Exile the top three cards of target opponent's library. Choose one of them. Until the end of your next turn, you may play that card, and you may spend mana as though it were mana of any color to cast it."
Outrageous Robbery80%
$0.38↑#4711↓0.402.6 years↓
"Target opponent exiles the top X cards of their library face down. You may look at and play those cards for as long as they remain exiled. If you cast a spell this way, you may spend mana as though it were mana of any type to cast it."
Knacksaw Clique80%
$3.35↑#17338↓0.20↓18.3 years↑
"
, 
: Target opponent exiles the top card of their library. Until end of turn, you may play that card."
, : Target opponent exiles the top card of their library. Until end of turn, you may play that card."
Klaw, Master of Sound80%
$0.27↓#17473↓0.00↓0.2 years↓
"Whenever this card deals combat damage to a player, look at the top card of that player's library, then exile it face down. You may play it for as long as it remains exiled. Mana of any type can be spent to cast a spell this way."
Kotis, the Fangkeeper79%
$0.36↑#5349↓0.84↑1.4 years↓
"Whenever this card deals combat damage to a player, exile the top X cards of their library, where X is the amount of damage dealt. You may cast any number of spells with mana value X or less from among them without paying their mana costs."
Stolen Goods78%
$0.25↓#9128↓0.92↑14.3 years↑
"Target opponent exiles cards from the top of their library until they exile a nonland card. Until end of turn, you may cast that card without paying its mana cost."
Predators' Hour78%
$0.35↑#7510↓0.384.8 years↓
"Until end of turn, creatures you control gain menace and "Whenever this creature deals combat damage to a player, exile the top card of that player's library face down. You may look at and play that card for as long as it remains exiled, and you may spend mana as though it were mana of any color to cast that spell.""
Rev, Tithe Extractor78%
$21.22↑#2337↓0.67↑1.8 years↓
"Whenever one or more creatures you control deal combat damage to a player, create a Treasure token, then look at the top card of that player's library and exile it face down. You may cast that card for as long as it remains exiled."
Fallen Shinobi78%
$6.62↑#2059↓0.48↑7.2 years↓
"Whenever this creature deals combat damage to a player, that player exiles the top two cards of their library. Until end of turn, you may play those cards without paying their mana costs."
Breeches, Brazen Plunderer78%
$0.24↓#4616↓0.23↓5.8 years↓
"Whenever one or more Pirates you control deal damage to your opponents, exile the top card of each of those opponents' libraries. You may play those cards this turn, and you may spend mana as though it were mana of any color to cast those spells."
Villainous Wealth78%
$0.29↑#2406↓0.63↑11.9 years↑
"Target opponent exiles the top X cards of their library. You may cast any number of spells with mana value X or less from among them without paying their mana costs."
Ornate Kanzashi77%
$0.34↑#26616↓0.05↓21.6 years↑
"
, 
: Target opponent exiles the top card of their library. You may play that card this turn."
, : Target opponent exiles the top card of their library. You may play that card this turn."
Uvilda, Dean of Perfection // Nassari, Dean of Expression76%
$0.28#16667↓0.46↑5.4 years↓
"At the beginning of your upkeep, exile the top card of each opponent's library. Until end of turn, you may cast spells from among those exiled cards, and you may spend mana as though it were mana of any color to cast those spells."
Siphon Insight76%
$0.23↓#4324↓0.374.9 years↓
"Look at the top two cards of target opponent's library. Exile one of them face down and put the other on the bottom of that library. You may play the exiled card for as long as it remains exiled, and you may spend mana as though it were mana of any color to cast that spell."
Daxos of Meletis76%
$0.21↓#10152↓0.13↓12.9 years↑
"Whenever Daxos deals combat damage to a player, exile the top card of that player's library. You gain life equal to that card's mana value. Until end of turn, you may cast that card and you may spend mana as though it were mana of any color to cast that spell."
Bismuth Mindrender76%
$0.36↑#7309↓0.65↑2.2 years↓
"Whenever this creature deals combat damage to a player, that player exiles cards from the top of their library until they exile a nonland card. You may cast that card by paying life equal to the spell's mana value rather than paying its mana cost."