Rowan's Battleguard 
Creature — Human Knight
$0.13 #30680 0.24 6.9 years
First strike
As long as you control a Rowan planeswalker, this creature gets +3/+0.
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Cards similar to Rowan's Battleguard 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.
Celestial Messenger74%
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"This creature gets +2/+2 as long as you control a Garruk planeswalker."
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"This creature gets +2/+0 as long as you control an Angrath planeswalker."
Vivien's Crocodile72%
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"This creature gets +1/+1 as long as you control a Vivien planeswalker."
Court Cleric72%
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"This creature gets +1/+1 as long as you control an Ajani planeswalker."
Teferi's Sentinel72%
$0.10↓#298410.43↑8.4 years↑
"As long as you control a Teferi planeswalker, this creature gets +4/+0."
Renegade Firebrand71%
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"As long as you control a Chandra planeswalker, this creature gets +1/+0 and has first strike."
Ral's Staticaster70%
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"Whenever this creature attacks, if you control a Ral planeswalker, this creature gets +1/+0 for each card in your hand until end of turn."