Rowan's Battleguard 
Creature — Human Knight
$0.15 #30954 0.00 7.0 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 Messenger76%
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Predatory Wurm76%
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"This creature gets +2/+2 as long as you control a Garruk planeswalker."
Angrath's Ambusher74%
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"This creature gets +2/+0 as long as you control an Angrath planeswalker."
Vivien's Crocodile74%
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"This creature gets +1/+1 as long as you control a Vivien planeswalker."
Court Cleric73%
$0.15#280920.058.3 years↑
"This creature gets +1/+1 as long as you control an Ajani planeswalker."
Teferi's Sentinel73%
$0.10↓#300280.068.5 years↑
"As long as you control a Teferi planeswalker, this creature gets +4/+0."
Renegade Firebrand72%
$0.08↓#278840.0010.1 years↑
"As long as you control a Chandra planeswalker, this creature gets +1/+0 and has first strike."
Ral's Staticaster71%
$0.18↑#306120.11↑8.0 years
"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."
Dovin's Automaton70%
$0.23↑#299920.16↑7.7 years
"As long as you control a Dovin planeswalker, this creature gets +2/+2 and has vigilance."
Guardian of the Great Conduit70%
$0.03↓#297770.0510.1 years↑
"As long as you control a Nissa planeswalker, this creature gets +2/+0 and has vigilance."