Gorilla Pack 

Creature — Ape
This creature can't attack unless defending player controls a Forest.
When you control no Forests, sacrifice this creature.
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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.
Lurking Green Dragon 85%
$0.21#22222
"This creature can't attack unless defending player controls a creature with flying."
Bloodcrazed Goblin 84%
$0.18#25197
"This creature can't attack unless an opponent has been dealt damage this turn."
Goblin Cohort 84%
$0.24#24308
"This creature can't attack unless you've cast a creature spell this turn."
Mogg Conscripts 84%
#27105
"This creature can't attack unless you've cast a creature spell this turn."
Glacial Crasher 84%
$0.07#30824
"This creature can't attack unless there is a Mountain on the battlefield."
Goblin Rock Sled 83%
$0.06#30506
"This creature can't attack unless defending player controls a Mountain."
Crown-Hunter Hireling 83%
$0.18#24193
"This creature can't attack unless defending player is the monarch."
Bog Serpent 83%
$0.11#30139
"This creature can't attack unless defending player controls a Swamp."
+1 more matching line
Harbor Serpent 83%
$0.14#20206
"This creature can't attack unless there are five or more Islands on the battlefield."
Warden of the Chained 83%
$0.10#27889
"This creature can't attack unless you control another creature with power 4 or greater."
Lambholt Pacifist // Lambholt Butcher 83%
$0.21#23485
"This creature can't attack unless you control a creature with power 4 or greater."
Bloodthirster 83%
$32.32#2531
"This creature can't attack a player it has already attacked this turn."