Tromokratis 
Legendary Creature — Kraken
$0.19 #4961 0.29 12.6 years
Tromokratis has hexproof unless it's attacking or blocking.
Tromokratis can't be blocked unless all creatures defending player controls block it. (If any creature that player controls doesn't block this creature, it can't be blocked.)
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Cards similar to Tromokratis 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.
Rampaging Ceratops85%
$0.20↑#12192↓0.222.8 years↓
"This creature can't be blocked except by three or more creatures."
Relentless X-ATM09278%
$0.28↑#11491↓0.311.2 years↓
"This creature can't be blocked except by three or more creatures."
Gorilla Berserkers76%
$0.19#14862↓0.07↓30.2 years↑
"This creature can't be blocked except by three or more creatures."
Troll of Khazad-dûm75%
$0.98↑#2775↑0.14↓3.2 years↓
"This creature can't be blocked except by three or more creatures."
Phyrexian Colossus75%
$0.25↑#22556↓0.07↓27.9 years↑
"This creature can't be blocked except by three or more creatures."
Pathrazer of Ulamog74%
$1.24↑#2417↑0.87↑16.4 years↑
"This creature can't be blocked except by three or more creatures."
Stoic Sphinx74%
$0.13↓#21465↓0.05↓2.4 years↓
"This creature has hexproof as long as you haven't cast a spell this turn."
Underworld Cerberus73%
$0.34↑#24124↓0.56↑12.9 years
"This creature can't be blocked except by three or more creatures."
Hexmark Destroyer71%
$0.40↑#14419↓0.253.9 years↓
"This creature can't be blocked except by six or more creatures."
Graxiplon70%
$0.16↓#31803↓0.11↓23.9 years↑
"This creature can't be blocked unless defending player controls three or more creatures that share a creature type."
Slippery Scoundrel70%
$0.17↓#16112↓0.278.6 years↓
"As long as you have the city's blessing, this creature has hexproof and can't be blocked."
Guile70%
$0.80↑#11663↓0.64↑18.9 years↑
"This creature can't be blocked except by three or more creatures."