Bant Sureblade 

Creature — Human Soldier
As long as you control another multicolored permanent, this creature gets +1/+1 and has first strike.
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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.
Ember Weaver 87%
$0.18#27063
"As long as you control a red permanent, this creature gets +1/+0 and has first strike."
Renegade Firebrand 82%
$0.07#27176
"As long as you control a Chandra planeswalker, this creature gets +1/+0 and has first strike."