Jace's Sentinel 
Creature — Merfolk Warrior
$0.15 #25286 0.25 8.9 years
As long as you control a Jace planeswalker, this creature gets +1/+0 and can't be blocked.
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Cards similar to Jace's Sentinel 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.
Jace's Projection75%
$0.28↑#15401↑0.307.3 years↓
"
: Put a loyalty counter on target Jace planeswalker."
: Put a loyalty counter on target Jace planeswalker."
Court Cleric72%
$0.19↑#280410.09↓8.1 years
"This creature gets +1/+1 as long as you control an Ajani planeswalker."
Swimmer in Nightmares72%
$0.24↑#284740.43↑6.6 years↓
"This creature can't be blocked as long as you control an Ashiok planeswalker."