Stalking Stones
Land
{T}: Add {C}.
{6}: This land becomes a 3/3 Elemental artifact creature that's still a land. (This effect lasts indefinitely.)
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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.
Cavernous Maw 89%
$0.17#14402
"{2}: This land becomes a 3/3 Elemental creature until end of turn. It's still a Cave land. Activate only if the number of other Caves you control plus the number of Cave cards in your graveyard is three or greater."
+1 more matching line
Mishra's Foundry 86%
$0.33#7478
"{2}: This land becomes a 2/2 Assembly-Worker artifact creature until end of turn. It's still a land."
+1 more matching line
Mobilized District 85%
$0.24#9106
"{4}: This land becomes a 3/3 Citizen creature with vigilance until end of turn. It's still a land. This ability costs {1} less to activate for each legendary creature and planeswalker you control."
+1 more matching line
Dread Statuary 85%
$0.20#11575
"{4}: This land becomes a 4/2 Golem artifact creature until end of turn. It's still a land."
+1 more matching line
Mishra's Factory 85%
$0.20#3083
"{1}: This land becomes a 2/2 Assembly-Worker artifact creature until end of turn. It's still a land."
+1 more matching line