Intrepid Outlander 

Creature — Orc Ranger
Reach
Pack tactics — Whenever this creature attacks, if you attacked with creatures with total power 6 or greater this combat, venture into the dungeon. (Enter the first room or advance to the next room.)
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Cards that do something similar 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.
Yuan Shao's Infantry 83%
$5.31#31156
"Whenever this creature attacks alone, this creature can't be blocked this combat."
Ogre Marauder 83%
$0.25#24804
"Whenever this creature attacks, it gains "this creature can't be blocked" until end of turn unless defending player sacrifices a creature of their choice."
Yuan-Ti Malison 83%
$0.36#8392
"Whenever this creature deals combat damage to a player, venture into the dungeon."
Yuan-Ti Fang-Blade 83%
$0.24#13198
"Whenever this creature deals combat damage to a player, venture into the dungeon."
Shortcut Seeker 83%
$0.19#15442
"Whenever this creature deals combat damage to a player, venture into the dungeon."
Xantid Swarm 82%
$3.88#13727
"Whenever this creature attacks, defending player can't cast spells this turn."
Creepy Puppeteer 81%
$0.19#25029
"Whenever this creature attacks, if you attacked with exactly one other creature this combat, you may have that creature's base power and toughness become 4/3 until end of turn."
Smirking Spelljacker 80%
$2.79#6873
"Whenever this creature attacks, if a card is exiled with it, you may cast the exiled card without paying its mana cost."