Jace's Sentinel 
Creature — Merfolk Warrior
$0.13 #23425 0.00 9.1 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.
Mind Meanderer75%
$0.11↓#31437↓0.010.0 years↓
"This creature has vigilance as long as you control a Jace planeswalker."
Swimmer in Nightmares74%
$0.22↑#28966↓0.066.7 years↓
"This creature can't be blocked as long as you control an Ashiok planeswalker."
Jace's Projection74%
$0.35↑#14754↑0.19↑7.5 years↓
"
: Put a loyalty counter on target Jace planeswalker."
: Put a loyalty counter on target Jace planeswalker."
Court Cleric74%
$0.15↑#280920.058.3 years
"This creature gets +1/+1 as long as you control an Ajani planeswalker."
Ajani's Comrade70%
$0.14↑#261750.11↑9.7 years
"At the beginning of combat on your turn, if you control an Ajani planeswalker, put a +1/+1 counter on this creature."