Teferi's Sentinel 
Artifact Creature — Golem
$0.10 #29841 0.43 8.4 years
As long as you control a Teferi planeswalker, this creature gets +4/+0.
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Cards similar to Teferi'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.
Historian of Zhalfir84%
$0.03↓#309260.29↓6.2 years↓
"Whenever this creature attacks, if you control a Teferi planeswalker, draw a card."
Vivien's Crocodile72%
$0.29↑#305270.27↓7.2 years↓
"This creature gets +1/+1 as long as you control a Vivien planeswalker."
Rowan's Battleguard72%
$0.13↑#306800.24↓6.9 years↓
"As long as you control a Rowan planeswalker, this creature gets +3/+0."
Angrath's Ambusher71%
$0.16↑#308110.18↓8.6 years
"This creature gets +2/+0 as long as you control an Angrath planeswalker."
Court Cleric71%
$0.19↑#280410.09↓8.1 years
"This creature gets +1/+1 as long as you control an Ajani planeswalker."
Sunlit Hoplite70%
$0.17↑#277600.00↓6.6 years↓
"This creature gets +1/+0 as long as you control an Elspeth planeswalker."
Celestial Messenger70%
$0.11↑#309600.00↓7.2 years↓
"This creature gets +1/+1 as long as you control a Yanling planeswalker."
Predatory Wurm70%
$0.22↑#252290.416.2 years↓
"This creature gets +2/+2 as long as you control a Garruk planeswalker."